| Not Yet Recruiting | Chatbot for Online Support Groups to Treat Tobacco Addiction NCT06952725 | University of California, Irvine | N/A |
| Not Yet Recruiting | Varenicline for Smoking Reduction in Veterans Not Ready To Quit NCT06966362 | VA Office of Research and Development | Phase 4 |
| Recruiting | C-Raven, a Virtual Tobacco Cessation Intervention in Residency Clinics NCT07220356 | Johns Hopkins University | Phase 4 |
| Recruiting | Extended Intervention for Tobacco Use (EXIT) for People Experiencing Homelessness NCT07148232 | University of California, San Francisco | Phase 4 |
| Enrolling By Invitation | Cytisine vs Nicotine Replacement Therapy NCT03249428 | Ottawa Hospital Research Institute | N/A |
| Not Yet Recruiting | Semaglutide for Smoking Cessation in Patients With Diabetes NCT07059377 | Ottawa Heart Institute Research Corporation | Phase 3 |
| Not Yet Recruiting | Smoking Cessation Intervention Including Health Navigators to Address Unmet Social Needs of Parents Who Smoke NCT06651684 | St. Justine's Hospital | N/A |
| Recruiting | Reach Through Equitable Implementation in Utah NCT06881069 | University of Utah | N/A |
| Enrolling By Invitation | Effect of Nicotine Gingival Fibroblast Intoxication on the Response of Periodontal Treatment NCT07491627 | University of Liege | N/A |
| Recruiting | Effect of Yoga on Reducing Craving in Tobacco Dependent Individuals NCT06488443 | University of Pittsburgh | N/A |
| Recruiting | Cannabidiol for Reducing Cigarette Use NCT06218056 | University of California, Los Angeles | Phase 2 |
| Completed | C-Raven, a Virtual Tobacco Cessation Intervention in the Community NCT06545669 | Johns Hopkins University | Phase 4 |
| Completed | Positive Psychology for Smoking Cessation NCT06632756 | Dartmouth-Hitchcock Medical Center | N/A |
| Recruiting | Harm Reduction for Smokers With Mental Illness NCT06543407 | Dartmouth-Hitchcock Medical Center | N/A |
| Recruiting | Use of Nicotine Pouches Among Daily Smokers NCT06043362 | Milton S. Hershey Medical Center | N/A |
| Recruiting | Smoke-free Home Study in Subsidized Housing NCT06170437 | University of California, San Francisco | N/A |
| Completed | Cooling Agent Pilot Among Adult Menthol Smokers NCT06477601 | University of Kansas Medical Center | N/A |
| Completed | Testing C-Raven, a Virtual Tobacco Cessation Intervention, in the Community NCT06289192 | Johns Hopkins University | Phase 4 |
| Completed | Tobacco Cessation Care for Cancer Patients by Automated Interactive Outreach NCT05829824 | University of California, San Francisco | N/A |
| Withdrawn | Equitable Smoking Relapse Prevention NCT05625685 | Bryan W. Heckman | N/A |
| Recruiting | Adapting and Evaluating a Tobacco Use Cessation Program for People Living With HIV in Uganda and Zambia NCT05487807 | University of Southern California | Phase 1 |
| Recruiting | FRESH Delivers: An Innovative Approach to Reducing Tobacco Use Among Rural Smokers NCT05429892 | University of Arkansas | N/A |
| Completed | Testing the Effect of ENDS Flavors on Neurotransmission NCT05836051 | Milton S. Hershey Medical Center | N/A |
| Completed | DBT for Smoking Cessation in High Risk Veterans NCT06687577 | Veterans Medical Research Foundation | N/A |
| Active Not Recruiting | Assessment of Biomarkers in Children to Help Parents Quit Tobacco NCT04832659 | Massachusetts General Hospital | N/A |
| Completed | Interactive Mobile Doctor (iMD) to Promote Tobacco Cessation Among Cancer Patients NCT05021185 | University of California, San Francisco | N/A |
| Recruiting | Oral Cannabidiol for Tobacco Cessation NCT05445804 | Johns Hopkins University | Phase 1 |
| Completed | Does Switching to Nicotine Containing Electronic Cigarettes Reduce Health Risk Markers NCT03625986 | Milton S. Hershey Medical Center | N/A |
| Completed | CO Monitoring for Tobacco Cessation in Quitlines NCT05327660 | Consumer Wellness Solutions | Phase 1 / Phase 2 |
| Completed | Mixed Presentation on Social Media NCT05066126 | University of Pennsylvania | N/A |
| Completed | Cigarette Smoking in Smokers With and Without Schizophrenia NCT04001114 | University of Maryland, Baltimore | N/A |
| Completed | UW Withdraw From Tobacco Study NCT04969198 | University of Wisconsin, Madison | Phase 2 |
| Completed | Low Nicotine Cigarettes Plus Electronic Cigarettes NCT04058717 | Milton S. Hershey Medical Center | N/A |
| Completed | Measuring Neuroadaptations in Response to Very Low Nicotine Content Cigarettes NCT03612960 | Milton S. Hershey Medical Center | N/A |
| Completed | Identifying Effective Treatment for Veterans Unwilling to Quit Smoking NCT04061720 | VA Office of Research and Development | N/A |
| Completed | Establishing the Effect of Flavor on the Addictive Potential of Electronic Cigarettes NCT03905928 | Milton S. Hershey Medical Center | N/A |
| Completed | Assisting Smokers to Switch to a JUUL E-Cigarette by Devaluing Combustible Cigarettes NCT04188197 | Rose Research Center, LLC | N/A |
| Recruiting | Early Withdrawal Exposure and Negative Affect Withdrawal (NAW) Regulation Training for Smoking Cessation NCT03912194 | University of Alabama at Birmingham | Phase 3 |
| Completed | Personalized Feedback for Distress Intolerant Smokers NCT03918031 | University of Houston | N/A |
| Completed | An Extended Facebook Intervention for Young Sexual and Gender Minority Smokers NCT03553992 | University of California, San Francisco | N/A |
| Withdrawn | Clinical Trial of an Innovative Digital Therapeutic for Smoking Cessation With Biochemical Verification NCT05440721 | Click Therapeutics, Inc. | N/A |
| Completed | Innovative Digital Therapeutic for Smoking Cessation NCT03694327 | My Digital Study | N/A |
| Unknown | The Interplay Between Addiction to Tobacco Smoking and Sleep Quality Among Healthy Adults NCT04265339 | The Max Stern Academic College Of Emek Yezreel | N/A |
| Completed | Using Non-invasive Brain Stimulation (tDCS) With Varenicline for Treating Tobacco Dependence NCT03841292 | Centre for Addiction and Mental Health | N/A |
| Completed | Addictive Potential of LCCs in Dual Users NCT03496077 | UConn Health | N/A |
| Completed | Varenicline OTC Trial on Efficacy and Safety NCT03557294 | Arizona State University | Phase 4 |
| Terminated | Targeted Pharmacological and Behavioral Treatments for Smoking in Schizophrenia Study 1 NCT03507127 | Brown University | Phase 2 |
| Completed | A Facebook Intervention for Young Sexual and Gender Minority Smokers NCT03259360 | University of California, San Francisco | N/A |
| Terminated | Electroretinogram: a New Human Biomarker for Smoking Cessation Treatment NCT03213418 | New York State Psychiatric Institute | N/A |
| Completed | UW Quitting Using Intensive Treatment Study (QUITS) NCT03176784 | University of Wisconsin, Madison | Phase 4 |
| Completed | Personalized Feedback for Smokers With Elevated Anxiety Sensitivity NCT03382093 | University of Houston | N/A |
| Completed | Clinical Study to Assess Bioequivalence Between Nicorette Extra Mint Gum and Nicorette® Mint Gum in Healthy Sm NCT03259607 | McNeil AB | Phase 1 |
| Completed | Helping Poor Smokers Quit NCT03194958 | Washington University School of Medicine | N/A |
| Completed | A Bioequivalence Study Between Two Nicotine Replacement Therapies in Adult Healthy Smokers Motivated to Quit. NCT03130179 | McNeil AB | Phase 1 |
| Completed | The Appeal and Impact of E-cigarettes in Smokers With SMI NCT03050853 | Dartmouth-Hitchcock Medical Center | N/A |
| Withdrawn | Preventing Tobacco Relapse With Omega-3s Trial NCT03113370 | Vanderbilt University Medical Center | N/A |
| Completed | Using a Teachable Moment Communication Process to Improve Outcomes of Quitline Referrals NCT02764385 | Case Western Reserve University | N/A |
| Completed | European Regulatory Science on Tobacco: Policy Implementation to Reduce Lung Diseases (EUREST-PLUS) NCT02773836 | European Network For Smoking and Tobacco Prevention | — |
| Completed | Clinical Trial of Smoking Cessation Mobile Phone Program NCT02656745 | Click Therapeutics, Inc. | N/A |
| Completed | Smoking-cessation: A Spanish-Language Clinical Trial NCT02611076 | H. Lee Moffitt Cancer Center and Research Institute | N/A |
| Completed | Tobacco Treatment for Employable Californians, Total IMPACT Study NCT02478697 | Stanford University | N/A |
| Completed | Reduced Nicotine Content Cigarettes in Smokers of Lower Socioeconomic Status NCT01928719 | Milton S. Hershey Medical Center | N/A |
| Completed | Cardiovascular Effects of Chronic Snus Use NCT02564289 | Umeå University | — |
| Completed | Reduced Nicotine Cigarettes in Smokers With Mood and Anxiety Disorders NCT01928758 | Milton S. Hershey Medical Center | N/A |
| Completed | Healing and Empowering Alaskan Lives Towards Healthy-Hearts Study NCT02137902 | Stanford University | N/A |
| Completed | Changing Pediatric Office Systems Nationally to Address Parental Tobacco Use NCT01882348 | Massachusetts General Hospital | N/A |
| Completed | Study to Determine the Efficacy and Safety of a Novel Nicotine Replacement Therapy NCT02355665 | McNeil Consumer Healthcare Division of McNEIL-PPC, Inc. | Phase 3 |
| Completed | A Multi-center Trial of IMPaCT CHW Support for Chronically-ill Patients NCT02347787 | University of Pennsylvania | N/A |
| Completed | Varenicline for Co-occurring Cannabis and Tobacco Use NCT04595318 | Albert Einstein College of Medicine | Phase 4 |
| Terminated | Tobacco Treatment as Augmentation for Cognitive Processing Therapy for PTSD NCT02012452 | VA Office of Research and Development | N/A |
| Completed | Very Low Nicotine Cigarettes in Smokers With Schizophrenia NCT02019459 | Brown University | Phase 2 |
| Completed | Behavioral Activation for Smoking Cessation in PTSD NCT01995123 | VA Office of Research and Development | N/A |
| Completed | Translating Extinction Research to Improve Pharmacotherapy for Tobacco Dependence NCT02202499 | H. Lee Moffitt Cancer Center and Research Institute | EARLY_Phase 1 |
| Completed | The PROMPT Pilot Study NCT03626064 | Ottawa Hospital Research Institute | N/A |
| Withdrawn | cSBI-M for Young Military Personnel NCT01847300 | Boston Children's Hospital | N/A |
| Completed | Project 1, Study 1: Investigating the Impact of Nicotine Using Spectrum Cigarettes NCT01681875 | Wake Forest University Health Sciences | N/A |
| Completed | Improving Health for Aboriginal People Through Tobacco Related Research NCT01735448 | The Queen Elizabeth Hospital | — |
| Completed | Studying the Effects of Administration of Polyunsaturated Fatty Acids (PUFAS) of Omega-3 Series in Nicotine De NCT01735279 | Federal University of São Paulo | Phase 3 |
| Unknown | Effectiveness of an E-mail Tracking Intervention Among the Continued Abstinence of Tobacco Consumption NCT01494246 | Fundacio d'Investigacio en Atencio Primaria Jordi Gol i Gurina | Phase 4 |
| Completed | Web Assisted Tobacco Intervention With Community Colleges NCT01692730 | University of Rochester | N/A |
| Unknown | tDCS as Add on Therapy for Treatment of Tobacco Dependence by Standardized Behaviour Therapy NCT01729507 | Ludwig-Maximilians - University of Munich | Phase 4 |
| Completed | Yoga as a Complementary Therapy for Smoking Cessation NCT01809678 | The Miriam Hospital | N/A |
| Completed | Acute Effects of Exercise in Smokers With Schizophrenia NCT01635075 | Brown University | Phase 2 |
| Completed | New Hampshire Medicaid Wellness Incentive Program NCT02515981 | Dartmouth-Hitchcock Medical Center | N/A |
| Terminated | Tobacco Dependence in Breast Cancer Patients Trial of Varenicline (Chantix) NCT01532232 | Memorial Sloan Kettering Cancer Center | — |
| Completed | An Exploratory Study Comparing Two Nicotine Inhalers NCT01478230 | McNeil AB | EARLY_Phase 1 |
| Completed | Study to Evaluate the Safety and Efficacy of Dietary Supplement Anatabloc in Reducing Daily Smokers' Urge to S NCT01428310 | Rock Creek Pharmaceuticals, Inc. | Phase 1 |
| Completed | Positively Smoke Free on the Web (PSFW) for Smokers Living With HIV NCT01570595 | Georgetown University | Phase 1 / Phase 2 |
| Completed | System Based Tracking and Treatment for Emergency Patients Who Smoke: STTEPS NCT01839903 | The Miriam Hospital | N/A |
| Completed | Tailoring Varenicline to Individual Needs (TVIN Study) NCT01206010 | Queen Mary University of London | Phase 3 |
| Completed | De-nicotinised Cigarettes Study NCT01250301 | Queen Mary University of London | N/A |
| Completed | Varenicline Treatment for Active Alcoholic Smokers NCT01347112 | Mayo Clinic | Phase 2 / Phase 3 |
| Completed | Nicotine Pharmacodynamics With a New Oral Nicotine Replacement Therapy and Nicotine Gum NCT01368016 | McNeil AB | N/A |
| Completed | Combination of Nicotine Replacement Therapy (NRT) and Varenicline to Increase Cessation of Tobacco (CONVICT St NCT01184664 | Queen Mary University of London | Phase 3 |
| Completed | Tobacco Intervention in Buprenorphine Treatment NCT01350011 | University of California, San Francisco | Phase 3 |
| Completed | A Study of Novel Smoking Cessation Interventions in Current and Former Injection Drug Users NCT01334736 | Johns Hopkins University | N/A |
| Completed | Varenicline in Combination With Nicotine Replacement Therapy for Smoking Cessation NCT01444131 | University of Stellenbosch | Phase 2 |
| Terminated | Study to Determine if a New Nicotine Replacement Therapy Can Safely Help Smokers to Quit Smoking NCT01296698 | McNeil Consumer Healthcare Division of McNEIL-PPC, Inc. | Phase 3 |
| Completed | Multiple-dose Nicotine Pharmacokinetics With Three Oral Nicotine Replacement Products NCT01321931 | McNeil AB | Phase 1 |
| Completed | Virtual Clinician Research Tool NCT01408758 | University of Rochester | N/A |
| Completed | Tobacco Cessation Interventions With Ohio Appalachian Smokers NCT02695225 | Ohio State University | N/A |
| Completed | Single-dose Nicotine Pharmacokinetics With Four Oral Nicotine Replacement Products NCT01234896 | McNeil AB | N/A |
| Completed | Novel Determinants and Measures of Smokeless Tobacco Use: Study 1 NCT01067586 | University of Minnesota | — |
| Completed | Bioequivalence Between an Oral Nicotine Replacement Product and Nicorette® Gum NCT01152749 | McNeil AB | N/A |
| Completed | Tobacco Dependence Treatment for Asian Americans NCT01091363 | University of Massachusetts, Boston | N/A |
| Completed | Changing Thought and Action in Tobacco Dependence With Transcranial Magnetic Stimulation NCT00973622 | University of Arkansas | N/A |
| Completed | Efficacy and Safety of Varenicline Among HIV-infected Patients NCT00918307 | ANRS, Emerging Infectious Diseases | Phase 3 |
| Completed | Evaluation of Tobacco Treatment Strategies for Inpatient Psychiatry NCT00968513 | Stanford University | N/A |
| Unknown | Varenicline for Long-term Nicotine Replacement Therapy (NRT) Users NCT00977249 | University Hospital, Gentofte, Copenhagen | Phase 2 / Phase 3 |
| Completed | Comparative Pharmacokinetic Study of New Oral Nicotine Replacement Therapy Products. NCT01227720 | McNeil AB | N/A |
| Completed | Direct to Smoker Outreach in a Health Care Setting NCT01321944 | Massachusetts General Hospital | N/A |
| Completed | Use of Varenicline for 4-weeks Prior to Quitting NCT00789074 | Queen Mary University of London | Phase 3 |
| Completed | Single-dose Nicotine Pharmacokinetics With a New Oral Nicotine Replacement Product NCT01084603 | McNeil AB | N/A |
| Completed | Evaluation of the Safety Profile, Quit and Reduction Rate After Nicorette® Gum and Patch Treatment NCT00749463 | McNeil AB | Phase 4 |
| Completed | Multiple-dose Nicotine Pharmacokinetics With a New Oral Nicotine Replacement Product. NCT01084707 | McNeil AB | N/A |
| Completed | Nicotine Lozenge or Tobacco-Free Snuff for Smokeless Tobacco Reduction NCT01018394 | Mayo Clinic | Phase 2 / Phase 3 |
| Completed | Pharmacokinetics With a New Oral Nicotine Replacement Product and Nicorette® Gum NCT01152736 | McNeil AB | N/A |
| Completed | Effect of Varenicline on Reactivity to Smoking and Drinking Cues NCT00873535 | Centre for Addiction and Mental Health | N/A |
| Completed | Bioequivalence Between Nicotine Replacement Products and Nicorette® Gum NCT01113424 | McNeil AB | N/A |
| Completed | Varenicline Effects on Cue Reactivity and Smoking Reward/Reinforcement NCT00747643 | H. Lee Moffitt Cancer Center and Research Institute | N/A |
| Completed | S-Adenosyl-L-Methionine (SAMe) for Smoking Abstinence NCT00722124 | Mayo Clinic | Phase 2 / Phase 3 |
| Completed | Bioequivalence Between Two New Oral Nicotine Replacement Therapy Products and Nicorette® Microtab NCT01238640 | McNeil AB | N/A |
| Completed | Single-dose Nicotine Pharmacokinetics With Three Oral Nicotine Replacement Products. A Study in Healthy Smoker NCT01234792 | McNeil AB | N/A |
| Completed | Pharmacokinetics With Two New Oral Nicotine Replacement Products and Nicorette® Gum NCT01152723 | McNeil AB | N/A |
| Completed | Bioequivalence Between Two Oral Nicotine Sublingual Tablets, 2 mg and 4 mg NCT01238627 | McNeil AB | N/A |
| Completed | Single-dose Pharmacokinetics of Oral Nicotine Replacement Products NCT01228617 | Johnson & Johnson Consumer and Personal Products Worldwide | N/A |
| Completed | Effects of Yoga and Cardiovascular Exercise on Smoking Motivation NCT01423578 | H. Lee Moffitt Cancer Center and Research Institute | N/A |
| Completed | Quitline Use in Surgical Patients NCT00656500 | Mayo Clinic | N/A |
| Completed | Behavioral Therapy for Reduction in Smoking Craving NCT00449293 | University of Pittsburgh | N/A |
| Completed | Topiramate Alone and in Combination With the Nicotine Patch for Smoking Cessation: A Pilot Study NCT00755716 | UConn Health | Phase 3 |
| Unknown | Smoking Cessation With Smokeless Tobacco, Nicotine Tablets and Nicotine Patches NCT00313105 | University Hospital, Gentofte, Copenhagen | Phase 2 / Phase 3 |
| Completed | The Pharmacogenetic Study , Readiness to Change, and Pharmacological Intervention for Smoking Cessation in Sch NCT00495352 | Yu-Li Hospital | Phase 4 |
| Completed | Reducing Ethnic Health Disparities: Motivating HIV+ Latinos to Quit Smoking NCT00503230 | Butler Hospital | Phase 3 |
| Completed | A Study on the Effects of Two Nicotine Replacement Products on Tooth Staining NCT01440985 | McNeil AB | N/A |
| Completed | Randomized Trial of Ultrashort Psychotherapy vs Sustained-Release Bupropion for Smoking Cessation NCT00484692 | Medical University Innsbruck | Phase 4 |
| Completed | Use of Pharmacotherapy to Reduce Cue-responsiveness in Smokers NCT00133757 | Centre for Addiction and Mental Health | Phase 1 |
| Completed | Prolonged Smoking Cessation Using Prescription Step Care NCT00170079 | University of Tennessee | N/A |
| Completed | Comparisons of Nicotine-free Cigarettes, Extra Low Nicotine Cigarettes vs. Medicinal Nicotine NCT00777569 | National Institute on Drug Abuse (NIDA) | Phase 2 |
| Completed | Predictors of Treatment Outcome for Smokers With and Without Schizophrenia NCT00501007 | Rutgers, The State University of New Jersey | — |
| Terminated | Efficacy and Safety of Bupropion for Treatment of Adolescent Smoking NCT00248118 | National Institute on Drug Abuse (NIDA) | Phase 2 / Phase 3 |
| Completed | Smoking Cessation Intervention: Effectiveness in Primary Care NCT00296647 | University of Wisconsin, Madison | Phase 4 |
| Completed | Effects of Naltrexone on Nicotine Reinforcement NCT00270231 | University of Pennsylvania | Phase 2 |
| Completed | Emergency Department Telephone Quitline NCT00394420 | Mayo Clinic | N/A |
| Terminated | Physical Activity as an Aid for Smoking Cessation NCT00521391 | University of Lausanne Hospitals | Phase 3 |
| Completed | Bupropion Alone or Combined With Nicotine Gum NCT01621022 | University of Wisconsin, Madison | Phase 4 |
| Completed | Bupropion SR Plus Counseling for Smoking Cessation NCT01621009 | University of Wisconsin, Madison | Phase 4 |
| Completed | ROSCAP: Reduction of Smoking in Cardiac Patients Study NCT00301626 | National Institutes of Health (NIH) | N/A |
| Completed | Safety, Tolerability and Efficacy of the Nicotine Patch and Gum for the Treatment of Adolescent Tobacco Depend NCT01208935 | National Institute on Drug Abuse (NIDA) | Phase 2 / Phase 3 |
| Completed | Provider and Peer Delivered Youth Smoking Intervention NCT00435344 | University of Massachusetts, Worcester | Phase 2 |