search
Back to results

Cannabis THC Potency, Metabolism, and Cognitive Impairment in Young Adults (THC-YA)

Primary Purpose

Cannabis Use, THC, Marijuana Use

Status
Not yet recruiting
Phase
Not Applicable
Locations
United States
Study Type
Interventional
Intervention
15% THC Potency Reduction
35% THC Potency Reduction
Sponsored by
University of California, San Francisco
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional other trial for Cannabis Use focused on measuring Cannabis, Marijuana, High Potency THC, Dabs, Wax, Young Adult, Youth

Eligibility Criteria

21 Years - 25 Years (Adult)All SexesAccepts Healthy Volunteers

Inclusion Criteria: Between the ages of 21-25 Resides in San Francisco Self-report cannabis concentrate use as their primary method of cannabis use Self-report using cannabis daily or almost daily (i.e., at least 6 out of 7 days during each of the last 4 weeks) Self-report only purchasing cannabis from regulated retail stores in California. Exclusion Criteria: Pregnant Regularly uses other drugs (other than nicotine)

Sites / Locations

  • University of California San Francisco

Arms of the Study

Arm 1

Arm 2

Arm Type

Experimental

Experimental

Arm Label

15% THC Potency Reduction Group

35% THC Potency Reduction Group

Arm Description

Participants will be incentivized to use THC products that are at least 15% less potent than baseline

Participants will be incentivized to use THC products that are at least 35% less potent than baseline

Outcomes

Primary Outcome Measures

Change in Rapid Visual Information Processing Score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Rapid Visual Information Processing test takes 9 minutes to complete and is scored on a scale of 0-54, with a higher score indicative of better cognitive performance.
Change in Paired Associates Learning score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Paired Associates Learning test takes 8 minutes to complete and is scored on a scale of 0-100%, with a higher percentage indicative of better cognitive performance.
Change in Delayed Matching-to-Sample Score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Delayed Matching-to-Sample test takes 7 minutes to complete and is scored on a scale of 0-100%, with a higher percentage indicative of better cognitive performance.
Change in Verbal Recognition Memory score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Verbal Recognition Memory test takes 6 minutes to complete and is scored on a scale of 0-36, with a higher score indicative of better cognitive performance
Change in Spatial Working Memory score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Spatial Working Memory test takes 4 minutes to complete and is scored on a scale of 0-306, with a lower score indicative of fewer errors and better cognitive performance.
Change in One-Touch Stockings of Cambridge score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The One-Touch Stockings of Cambridge test takes 10 minutes to complete and scores are based on the time it takes for a participant to solve 20 problems. Shorter time to solve a problem is indicative of better cognitive performance.
Change in Stop Signal Task score
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Stop Signal Task test takes 14 minutes to complete and is scored on a scale of 1-1000 milliseconds, with a shorter time indicative of better cognitive performance.

Secondary Outcome Measures

Baseline Urinary THC Excretion
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine.
Week 1 Urinary THC Excretion
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 1 THC levels will be compared to baseline urine THC levels.
Week 2 Urinary THC Excretion
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 2 THC levels will be compared to baseline THC levels.
Week 3 Urinary THC Excretion
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 3 THC levels will be compared to baseline THC levels.
Week 4 Urinary THC Excretion
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 4 THC levels will be compared to baseline THC levels.
Week 5 Urinary THC Excretion
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 5 THC levels will be compared to baseline THC levels.

Full Information

First Posted
October 4, 2023
Last Updated
October 4, 2023
Sponsor
University of California, San Francisco
Collaborators
Cannabis Public Policy Consulting
search

1. Study Identification

Unique Protocol Identification Number
NCT06077292
Brief Title
Cannabis THC Potency, Metabolism, and Cognitive Impairment in Young Adults
Acronym
THC-YA
Official Title
Impacts of THC Potency of Cannabis Concentrates and THC Metabolism on Cognitive Impairment in Young Adults
Study Type
Interventional

2. Study Status

Record Verification Date
October 2023
Overall Recruitment Status
Not yet recruiting
Study Start Date
January 1, 2024 (Anticipated)
Primary Completion Date
June 30, 2024 (Anticipated)
Study Completion Date
June 30, 2024 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
University of California, San Francisco
Collaborators
Cannabis Public Policy Consulting

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
No
Data Monitoring Committee
No

5. Study Description

Brief Summary
The goal of this interventional study is to determine the impact of high potency THC product use on cognitive function of young adults aged 21-25. The main question it aims to answer is: will cannabis users who switch to less potent THC products demonstrate improved cognitive function compared to baseline? Other questions this study aims to answer include: Can researchers accurately assess THC consumption among frequent cannabis users? Can researchers effectively incentivize cannabis users to use less potent THC products? Do genetic variations in THC metabolism impact urinary THC excretion? Do genetic variations in THC metabolism impact cognitive performance in cannabis users? Are quantitative urinary THC values predictive of cognitive impairment? How can researchers use research findings to inform harm reduction practices for people who use cannabis? Participants will submit blood and urine samples and be incentivized to use less potent THC products.
Detailed Description
The goal of this interventional study is to determine the impact of high potency THC product use on cognitive function of young adults aged 21-25. The aims aims of this study are: Evaluate feasibility of assessing THC consumption, genetic variation in THC metabolism, urinary THC excretion, and cognitive performance in users of high potency cannabis products. Test the effectiveness of an incentivization protocol aimed at encouraging cannabis users to use less potent THC products as a means of harm reduction. Compare group differences between the high and low THC-reduction groups on THC metabolism (urine) and cognitive performance while controlling for any changes in frequency and amount of cannabis used. Identify whether participant predisposition to poorly metabolize THC (i.e., CYP2C9*3 carriers vs. others) impacts urinary THC excretion in the experimental condition relative to baseline in both groups. Identify whether participant predisposition to poorly metabolize THC (i.e., CYP2C9*3 carriers vs. others) impacts cognitive performance in the experimental condition relative to baseline in both groups. Determine whether quantitative urinary THC values correlate with measures of cognitive performance. Communicate basic findings regarding relationships between variables and outcomes in the form of a scorecard to help provide harm reduction strategies for youth who use cannabis. Participants will: Undergo a baseline assessment of cognitive performance and will submit blood and urine samples to assess genetic variation in THC metabolism, and baseline urinary THC excretion. Be randomized to two groups: 1) lower THC reduction group (incentivized to use THC products that are at least 15% less potent than baseline) and 2) higher THC reduction group (incentivized to use THC products that are at least 35% less potent than baseline) . Submit urine samples at baseline and weekly for 5 weeks to measure urinary THC excretion. Complete weekly follow up surveys assessing cannabis use patterns, reinforcing value of the cannabis product(s) used, symptoms of cannabis withdrawal, and presence of positive and negative emotions. Undergo re-assessment of cognitive performance after 5 weeks of intervention. Researchers will compare if participants in each group are able to use less potent THC products and whether the use of less potent THC products results in improved cognitive function.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Cannabis Use, THC, Marijuana Use, Cognitive Impairment, THC Vaping
Keywords
Cannabis, Marijuana, High Potency THC, Dabs, Wax, Young Adult, Youth

7. Study Design

Primary Purpose
Other
Study Phase
Not Applicable
Interventional Study Model
Parallel Assignment
Masking
Investigator
Allocation
Randomized
Enrollment
110 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
15% THC Potency Reduction Group
Arm Type
Experimental
Arm Description
Participants will be incentivized to use THC products that are at least 15% less potent than baseline
Arm Title
35% THC Potency Reduction Group
Arm Type
Experimental
Arm Description
Participants will be incentivized to use THC products that are at least 35% less potent than baseline
Intervention Type
Behavioral
Intervention Name(s)
15% THC Potency Reduction
Intervention Description
Participants will be incentivized to use THC products that are at least 15% less potent than baseline
Intervention Type
Behavioral
Intervention Name(s)
35% THC Potency Reduction
Intervention Description
Participants will be incentivized to use THC products that are at least 35% less potent than baseline
Primary Outcome Measure Information:
Title
Change in Rapid Visual Information Processing Score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Rapid Visual Information Processing test takes 9 minutes to complete and is scored on a scale of 0-54, with a higher score indicative of better cognitive performance.
Time Frame
Baseline and 5 weeks
Title
Change in Paired Associates Learning score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Paired Associates Learning test takes 8 minutes to complete and is scored on a scale of 0-100%, with a higher percentage indicative of better cognitive performance.
Time Frame
Baseline and 5 weeks
Title
Change in Delayed Matching-to-Sample Score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Delayed Matching-to-Sample test takes 7 minutes to complete and is scored on a scale of 0-100%, with a higher percentage indicative of better cognitive performance.
Time Frame
Baseline and 5 weeks
Title
Change in Verbal Recognition Memory score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Verbal Recognition Memory test takes 6 minutes to complete and is scored on a scale of 0-36, with a higher score indicative of better cognitive performance
Time Frame
Baseline and 5 weeks
Title
Change in Spatial Working Memory score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Spatial Working Memory test takes 4 minutes to complete and is scored on a scale of 0-306, with a lower score indicative of fewer errors and better cognitive performance.
Time Frame
Baseline and 5 weeks
Title
Change in One-Touch Stockings of Cambridge score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The One-Touch Stockings of Cambridge test takes 10 minutes to complete and scores are based on the time it takes for a participant to solve 20 problems. Shorter time to solve a problem is indicative of better cognitive performance.
Time Frame
Baseline and 5 weeks
Title
Change in Stop Signal Task score
Description
Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores. The Stop Signal Task test takes 14 minutes to complete and is scored on a scale of 1-1000 milliseconds, with a shorter time indicative of better cognitive performance.
Time Frame
Baseline and 5 weeks
Secondary Outcome Measure Information:
Title
Baseline Urinary THC Excretion
Description
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine.
Time Frame
Baseline
Title
Week 1 Urinary THC Excretion
Description
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 1 THC levels will be compared to baseline urine THC levels.
Time Frame
7-10 days after study enrollment.
Title
Week 2 Urinary THC Excretion
Description
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 2 THC levels will be compared to baseline THC levels.
Time Frame
14-17 days after study enrollment.
Title
Week 3 Urinary THC Excretion
Description
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 3 THC levels will be compared to baseline THC levels.
Time Frame
21-24 days after study enrollment.
Title
Week 4 Urinary THC Excretion
Description
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 4 THC levels will be compared to baseline THC levels.
Time Frame
28-30 days after study enrollment.
Title
Week 5 Urinary THC Excretion
Description
Urinary THC excretion will be measured using liquid chromatography mass spectroscopy (LC/MS/MS). THC levels will be corrected/standardized for level of hydration by dividing total THC by total urine creatinine. Results range from <5 ng/mL to 5,000 ng/mL, with higher values indicative of more THC in the urine. Week 5 THC levels will be compared to baseline THC levels.
Time Frame
35-38 days after study enrollment.
Other Pre-specified Outcome Measures:
Title
Urinary THC Excretion in CYP2C9*3 carriers
Description
Predisposition to poorly metabolize THC will be measured at baseline using a blood test to identify carriers of the CYP2C9*3 genetic variant. We will then determine whether there are statistically significant differences in baseline and weekly urinary THC levels among CYP2C9*3 carriers compared to non-carriers while controlling for participant reported cannabis use patterns.
Time Frame
Baseline
Title
Cognitive Performance in CYP2C9*3 carriers
Description
Predisposition to poorly metabolize THC will be measured at baseline using a blood test to identify carriers of the CYP2C9*3 genetic variant. We will then determine whether there are statistically significant differences in baseline and 5-week cognitive performance between CYP2C9*3 carriers compared to non-carriers while controlling for participant reported cannabis use patterns. Cognitive performance will be assessed using the CANTAB, a computer-based cognitive assessment system. Participants in this study will complete a battery of seven neuropsychological tests. CANTAB is administered to subjects using a touch screen computer and is language- and culture- independent. Participants scores at 5 weeks will be compared to their baseline scores, with lower scores indicating more severe cognitive impairment.
Time Frame
Baseline
Title
Change in Cannabis Use Disorder Identification Identification Test (CUDIT) score
Description
Symptoms of a cannabis use disorder will be assessed at baseline using the Cannabis Use Disorder Identification Test (CUDIT). CUDIT scores range from 0 to 32, with a score of 12 or higher indicative of possible cannabis use disorder.
Time Frame
Baseline and 5 weeks
Title
Change in participant reported depression symptoms
Description
Symptoms of depression will be assessed at baseline and at 5 weeks using the Beck Depression Inventory (BDI). The BDI consists of 21 questions, with scores ranging from 0 to 63; a higher score is indicative of more symptoms of depression. Participant scores at 5 weeks will be compared to their baseline scores.
Time Frame
Baseline and 5 weeks
Title
Baseline Participant Reported Cannabis Use
Description
Participants will complete a baseline survey to determine their pattern of cannabis use one week prior to study enrollment. They will be asked to report the brand, name, and THC concentration of the cannabis product(s) they have been using. They will be able to upload photos of product packaging if available. They will be asked to report frequency of cannabis use by reporting whether they used their cannabis product in the morning, afternoon, and evening of each of the preceding 7 days.
Time Frame
Baseline
Title
Week 1 Participant Reported Cannabis Use
Description
Participants will complete a baseline survey to determine their pattern of cannabis use 7 days after study enrollment. They will be asked to report the brand, name, and THC concentration of the cannabis product(s) they have been using over the 7 preceding days. They will be asked to upload photos of product packaging. They will be asked to report frequency of cannabis use by reporting whether they used their cannabis product in the morning, afternoon, and evening of each of the preceding 7 days. THC concentration and frequency of use will be compared to baseline cannabis use.
Time Frame
7 days after study enrollment
Title
Week 2 Participant Reported Cannabis Use
Description
Participants will complete a baseline survey to determine their pattern of cannabis use 14 days after study enrollment. They will be asked to report the brand, name, and THC concentration of the cannabis product(s) they have been using over the 7 preceding days. They will be asked to upload photos of product packaging. They will be asked to report frequency of cannabis use by reporting whether they used their cannabis product in the morning, afternoon, and evening of each of the preceding 7 days. THC concentration and frequency of use will be compared to baseline cannabis use.
Time Frame
14 days after study enrollment
Title
Week 3 Participant Reported Cannabis Use
Description
Participants will complete a baseline survey to determine their pattern of cannabis use 21 days after study enrollment. They will be asked to report the brand, name, and THC concentration of the cannabis product(s) they have been using over the 7 preceding days. They will be asked to upload photos of product packaging. They will be asked to report frequency of cannabis use by reporting whether they used their cannabis product in the morning, afternoon, and evening of each of the preceding 7 days. THC concentration and frequency of use will be compared to baseline cannabis use.
Time Frame
21 days after study enrollment
Title
Week 4 Participant Reported Cannabis Use
Description
Participants will complete a baseline survey to determine their pattern of cannabis use 28 days after study enrollment. They will be asked to report the brand, name, and THC concentration of the cannabis product(s) they have been using over the 7 preceding days. They will be asked to upload photos of product packaging. They will be asked to report frequency of cannabis use by reporting whether they used their cannabis product in the morning, afternoon, and evening of each of the preceding 7 days. THC concentration and frequency of use will be compared to baseline cannabis use.
Time Frame
28 days after study enrollment
Title
Week 5 Participant Reported Cannabis Use
Description
Participants will complete a baseline survey to determine their pattern of cannabis use 35 days after study enrollment. They will be asked to report the brand, name, and THC concentration of the cannabis product(s) they have been using over the 7 preceding days. They will be asked to upload photos of product packaging. They will be asked to report frequency of cannabis use by reporting whether they used their cannabis product in the morning, afternoon, and evening of each of the preceding 7 days. THC concentration and frequency of use will be compared to baseline cannabis use.
Time Frame
35 days after study enrollment
Title
Baseline Adapted Cannabis Purchase Task
Description
The relative value of cannabis products used by participants during this trial will be assessed using the adaptive cannabis purchase task. Specifically, participants will be asked to report the largest amount of their preferred cannabis product they would "purchase" at a series of price points using visual analog scales. Participants will respond by placing a mark on the line to indicate their purchase amount, and responses will be anchored by 'none' and 'all of it' and will be coded as values 0-100. Higher values are indicative of higher value attributed to the cannabis product being used.
Time Frame
Baseline
Title
Week 1 Adaptive Cannabis Purchase Task
Description
The relative value of cannabis products used by participants during this trial will be assessed using the adaptive cannabis purchase task. Specifically, participants will be asked to report the largest amount of their preferred cannabis product they would "purchase" at a series of price points using visual analog scales. Participants will respond by placing a mark on the line to indicate their purchase amount, and responses will be anchored by 'none' and 'all of it' and will be coded as values 0-100. Higher values are indicative of higher value attributed to the cannabis product being used.
Time Frame
7 days after study enrollment
Title
Week 2 Adaptive Cannabis Purchase Task
Description
The relative value of cannabis products used by participants during this trial will be assessed using the adaptive cannabis purchase task. Specifically, participants will be asked to report the largest amount of their preferred cannabis product they would "purchase" at a series of price points using visual analog scales. Participants will respond by placing a mark on the line to indicate their purchase amount, and responses will be anchored by 'none' and 'all of it' and will be coded as values 0-100. Higher values are indicative of higher value attributed to the cannabis product being used.
Time Frame
14 days after study enrollment
Title
Week 3 Adaptive Cannabis Purchase Task
Description
The relative value of cannabis products used by participants during this trial will be assessed using the adaptive cannabis purchase task. Specifically, participants will be asked to report the largest amount of their preferred cannabis product they would "purchase" at a series of price points using visual analog scales. Participants will respond by placing a mark on the line to indicate their purchase amount, and responses will be anchored by 'none' and 'all of it' and will be coded as values 0-100. Higher values are indicative of higher value attributed to the cannabis product being used.
Time Frame
21 days after study enrollment
Title
Week 4 Adaptive Cannabis Purchase Task
Description
The relative value of cannabis products used by participants during this trial will be assessed using the adaptive cannabis purchase task. Specifically, participants will be asked to report the largest amount of their preferred cannabis product they would "purchase" at a series of price points using visual analog scales. Participants will respond by placing a mark on the line to indicate their purchase amount, and responses will be anchored by 'none' and 'all of it' and will be coded as values 0-100. Higher values are indicative of higher value attributed to the cannabis product being used.
Time Frame
28 days after study enrollment
Title
Week 5 Adaptive Cannabis Purchase Task
Description
The relative value of cannabis products used by participants during this trial will be assessed using the adaptive cannabis purchase task. Specifically, participants will be asked to report the largest amount of their preferred cannabis product they would "purchase" at a series of price points using visual analog scales. Participants will respond by placing a mark on the line to indicate their purchase amount, and responses will be anchored by 'none' and 'all of it' and will be coded as values 0-100. Higher values are indicative of higher value attributed to the cannabis product being used.
Time Frame
35 days after study enrollment
Title
Baseline Participant Reported Cannabis Withdrawal Symptoms
Description
Symptoms of cannabis withdrawal will be assessed using the Cannabis Withdrawal Scale (CWS). The CWS consists of 19 questions and assesses withdrawal symptoms as well as the impact of the symptoms on daily activities. The personal experience score ranges from 0-190, with a higher score indicative of more withdrawal symptoms. The negative experience score ranges from 0-190, with a higher number indicative of more negative impact on daily activities.
Time Frame
Baseline
Title
Week 5 Participant Reported Cannabis Withdrawal Symptoms
Description
Symptoms of cannabis withdrawal will be assessed using the Cannabis Withdrawal Scale (CWS). The CWS consists of 19 questions and assesses withdrawal symptoms as well as the impact of the symptoms on daily activities. The personal experience score ranges from 0-190, with a higher score indicative of more withdrawal symptoms. The negative experience score ranges from 0-190, with a higher number indicative of more negative impact on daily activities.
Time Frame
35 days after study enrollment
Title
Baseline Participant Reported Affect
Description
Positive and negative emotions will be assessed using the Positive and Negative Affect Scale (PANAS), which consists of 20 questions, 10 questions assessing positive emotions, and 10 questions assessing negative emotions. Each set of questions is scored on a scale of 10-50, with a higher score indicative of more positive or negative emotions, respectively.
Time Frame
Baseline
Title
Week 1 Participant Reported Affect
Description
Positive and negative emotions will be assessed using the Positive and Negative Affect Scale (PANAS), which consists of 20 questions, 10 questions assessing positive emotions, and 10 questions assessing negative emotions. Each set of questions is scored on a scale of 10-50, with a higher score indicative of more positive or negative emotions, respectively.
Time Frame
7 days after study enrollment
Title
Week 2 Participant Reported Affect
Description
Positive and negative emotions will be assessed using the Positive and Negative Affect Scale (PANAS), which consists of 20 questions, 10 questions assessing positive emotions, and 10 questions assessing negative emotions. Each set of questions is scored on a scale of 10-50, with a higher score indicative of more positive or negative emotions, respectively.
Time Frame
14 days after study enrollment
Title
Week 3 Participant Reported Affect
Description
Positive and negative emotions will be assessed using the Positive and Negative Affect Scale (PANAS), which consists of 20 questions, 10 questions assessing positive emotions, and 10 questions assessing negative emotions. Each set of questions is scored on a scale of 10-50, with a higher score indicative of more positive or negative emotions, respectively.
Time Frame
21 days after study enrollment
Title
Week 4 Participant Reported Affect
Description
Positive and negative emotions will be assessed using the Positive and Negative Affect Scale (PANAS), which consists of 20 questions, 10 questions assessing positive emotions, and 10 questions assessing negative emotions. Each set of questions is scored on a scale of 10-50, with a higher score indicative of more positive or negative emotions, respectively.
Time Frame
28 days after study enrollment
Title
Week 5 Participant Reported Affect
Description
Positive and negative emotions will be assessed using the Positive and Negative Affect Scale (PANAS), which consists of 20 questions, 10 questions assessing positive emotions, and 10 questions assessing negative emotions. Each set of questions is scored on a scale of 10-50, with a higher score indicative of more positive or negative emotions, respectively.
Time Frame
35 days after study enrollment

10. Eligibility

Sex
All
Minimum Age & Unit of Time
21 Years
Maximum Age & Unit of Time
25 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Between the ages of 21-25 Resides in San Francisco Self-report cannabis concentrate use as their primary method of cannabis use Self-report using cannabis daily or almost daily (i.e., at least 6 out of 7 days during each of the last 4 weeks) Self-report only purchasing cannabis from regulated retail stores in California. Exclusion Criteria: Pregnant Regularly uses other drugs (other than nicotine)
Central Contact Person:
First Name & Middle Initial & Last Name or Official Title & Degree
Veronika Mesheriakova, MD
Phone
415-502-3934
Email
Veronika.Mesheriakova@ucsf.edu
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Veronika Mesheriakova, MD
Organizational Affiliation
University of California, San Francisco
Official's Role
Principal Investigator
First Name & Middle Initial & Last Name & Degree
Michael Sofis, PhD
Organizational Affiliation
Cannabis Public Policy Consulting
Official's Role
Principal Investigator
Facility Information:
Facility Name
University of California San Francisco
City
San Francisco
State/Province
California
ZIP/Postal Code
94143
Country
United States
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Veronika Mesheriakova, MD
First Name & Middle Initial & Last Name & Degree
Veronika Mesheriakova, MD
First Name & Middle Initial & Last Name & Degree
Michael Sofis, PhD

12. IPD Sharing Statement

Plan to Share IPD
No
Citations:
PubMed Identifier
19005461
Citation
Sachse-Seeboth C, Pfeil J, Sehrt D, Meineke I, Tzvetkov M, Bruns E, Poser W, Vormfelde SV, Brockmoller J. Interindividual variation in the pharmacokinetics of Delta9-tetrahydrocannabinol as related to genetic polymorphisms in CYP2C9. Clin Pharmacol Ther. 2009 Mar;85(3):273-6. doi: 10.1038/clpt.2008.213. Epub 2008 Nov 12.
Results Reference
background
PubMed Identifier
27717258
Citation
Murray RM, Quigley H, Quattrone D, Englund A, Di Forti M. Traditional marijuana, high-potency cannabis and synthetic cannabinoids: increasing risk for psychosis. World Psychiatry. 2016 Oct;15(3):195-204. doi: 10.1002/wps.20341.
Results Reference
background
PubMed Identifier
16572123
Citation
Ramaekers JG, Kauert G, van Ruitenbeek P, Theunissen EL, Schneider E, Moeller MR. High-potency marijuana impairs executive function and inhibitory motor control. Neuropsychopharmacology. 2006 Oct;31(10):2296-303. doi: 10.1038/sj.npp.1301068. Epub 2006 Mar 29.
Results Reference
background
PubMed Identifier
31615592
Citation
D'Souza DC, Ganesh S, Cortes-Briones J, Campbell MH, Emmanuel MK. Characterizing psychosis-relevant phenomena and cognitive function in a unique population with isolated, chronic and very heavy cannabis exposure. Psychol Med. 2020 Oct;50(14):2452-2459. doi: 10.1017/S0033291719002721. Epub 2019 Oct 16.
Results Reference
background
PubMed Identifier
33783029
Citation
Bidwell LC, Martin-Willett R, Karoly HC. Advancing the science on cannabis concentrates and behavioural health. Drug Alcohol Rev. 2021 Sep;40(6):900-913. doi: 10.1111/dar.13281. Epub 2021 Mar 30.
Results Reference
background
PubMed Identifier
34177633
Citation
Bourque J, Potvin S. Cannabis and Cognitive Functioning: From Acute to Residual Effects, From Randomized Controlled Trials to Prospective Designs. Front Psychiatry. 2021 Jun 10;12:596601. doi: 10.3389/fpsyt.2021.596601. eCollection 2021.
Results Reference
background

Learn more about this trial

Cannabis THC Potency, Metabolism, and Cognitive Impairment in Young Adults

We'll reach out to this number within 24 hrs