Active clinical trials for "Tobacco Use Disorder"

The purpose of this study is to learn more about nicotine exposure and the safety of electronic cigarettes (EC). It will focus on the areas that are thought to most closely relate to the addictive potential of EC, namely: (1) EC as nicotine delivery devices, covering issues of nicotine intake and pharmacokinetics, temporal patterns of use and titration of nicotine; and (2) subjective effects of EC use, including relationship of use to reward, withdrawal and craving.

This is a study to determine the safety and effectiveness of silver salt in Ariva® Silver Wintergreen Lozenge on discouraging smoking, by its imparting an unfavorable taste to the smoker when tobacco is smoked.

A comparison of two products for oral nicotine replacement with respect to relief of urges to smoke after single doses of nicotine.

This study tests the use of handheld computer tablets to promote the integration of 5A's (Ask, Advise, Assess, Assist, Arrange) for smoking cessation in academic and community primary care clinics. Although most patients receive the "ask" and "advise" steps, only slightly more than half are "assessed" for readiness to change, less than half receive "assistance" in changing, and only 9% have an "arranged" follow-up. While the large majority of primary care providers support the 5A's model, negative attitudes and the lack of time, knowledge, and cessation skills are common obstacles. Alternate service delivery systems that address these obstacles and evidence-based strategies to promote their implementation are needed to improve provider adherence and 5A's fidelity.

This is a pilot project using functional magnetic resonance imaging (fMRI) to examine the influence of varenicline on reward processing, cognitive control, and regulation of craving in adolescent smokers. We hypothesize that adolescent smokers receiving varenicline, when compared with those receiving placebo, will have differential brain responses to anticipation of rewards, during exposure to the Stroop task, and in response to tobacco cues.

The purpose of this study is to determine the timeframe (relative to a stress task) that is most effective at attenuating the increase in symptoms of tobacco craving and withdrawal that occur when smokers are presented with stressful situations.

Background: - Smoking is thought to cause changes in the brain that lead to addiction and craving. Smokers who try to quit experience nicotine withdrawal symptoms that include irritability, anxiety, and difficulty concentrating. These symptoms make it difficult for people to stop smoking. Many people say that they continue smoking to help relieve these symptoms, often within the first week after trying to quit. Researchers want to study what is happening in the brain to cause these symptoms, which may help identify new ways to successfully quit smoking. Objectives: - To study nicotine withdrawal symptoms and brain function in smokers who stop smoking for 36 hours. Eligibility: - Individuals between 18 and 65 years of age who smoke at least 10 cigarettes per day. Participants must be able to stop smoking for 36 hours on two occasions. Design: Phase 1 This study will involve three visits to the National Institute on Drug Abuse. NOT be able to smoke for 36 hours before the two imaging visits. Wear a nicotine skin patch or a placebo (fake) patch during your 36 hour smoking abstinence period and study visits. Have your blood drawn to test for levels of stress-related hormones. Complete multiple MRI scanning sessions that last about 1.5 to 2 hours each. Undergo EEG (brain waves) recording. Answer questionnaires about how you think and feel. Complete various tasks and procedures inside and outside of the MRI scanner. Phase 2 This study will involve thirteen visits to the National Institute on Drug Abuse. Set a quit date and develop a treatment plan with a study therapist. Take Chantix (varenicline) every day for a period of 12 weeks. Meet for weekly and biweekly counseling sessions with a therapist. Answer questionnaires about how you think and feel. Phase 3 This study will involve three visits to the National Institute on Drug Abuse. Complete an MRI scanning session that will last about 20min each visit Meet with a study staff member on each visit who will ask you questions about your smoking behavior and how you think and feel.

This study will examine extended exposure to cigarettes varying in nicotine content among disadvantaged women. Disadvantaged women are at increased risk for smoking, nicotine dependence, and using high nicotine yield cigarettes and are also at significantly increased risk for smoking-related adverse health consequences, including cervical cancer, thrombosis related to hormone-based contraception, infertility, and early menopause. Studies testing an innovative regulatory strategy of reducing the nicotine content of cigarettes to a non-addictive level have shown promising beneficial effects (decreased smoking rate, reduced toxicant exposure, and increased cessation) in the general population of smokers. However, these studies have uniformly excluded vulnerable populations like disadvantaged women who may respond differently considering their greater vulnerability to smoking and nicotine dependence. Thus, little is known scientifically about how this highly vulnerable subgroup of smokers might respond to a nicotine reduction policy. This project is designed to address that substantial knowledge gap. This same study was also conducted in two additional vulnerable populations under a similar protocol.

The overall aim of this project is to evaluate the effect of progressive nicotine reduction in cigarettes on smoking behavior, toxin exposure and psychiatric symptoms in smokers with comorbid mood and/or anxiety disorders. Smokers with mood and/or anxiety disorder will smoke research cigarettes that will contain either a) nicotine content similar to their preferred usual brand of cigarettes, or b) nicotine content per cigarette that is progressively reduced from approximately 11.6 mg to 0.2 mg per cigarette over 18 weeks. It is our hypothesis that nicotine intake will decline as a function of cigarette nicotine content in the Reduced Nicotine Content group without significant increases in tobacco smoke exposure, severity of nicotine withdrawal symptoms, mood and anxiety symptomatology or protocol non-adherence over time in the Reduced Nicotine Content group as compared with the control group.

This project tests two hypotheses concerning the low smoking cessation rates in smokers with schizophrenia. The first hypothesis is that smokers with schizophrenia experience stronger and more sustained effects of smoking abstinence on negative mood and smoking urge than control smokers without psychiatric illness. The second hypothesis is that smokers with schizophrenia experience stronger reinforcing effects of a smoking lapse (i.e., more rewarding effects of smoking after a period of abstinence) than control smokers without psychiatric illness.