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ClinicalTrials.gov public records Last synced Oct 19, 2026, 7:40 PM EDT

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Showing 121–144 of 1,028 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Cigarettes Clear all
Completed Not applicable Interventional

Electronic Cigarettes as a Harm Reduction Strategy Among Patients With COPD

NCT04465318
View directory record Official record
Conditions
COPD
Interventions
E-cigarette (EC), Nicotine Replacement Therapy (NRT), Smoking Harm Reduction Counseling Sessions
Other · Behavioral
Lead sponsor
NYU Langone Health
Other
Eligibility
21 Years to 75 Years
Enrollment
146 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 15, 2023 · Synced Oct 19, 2026, 7:40 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Clinical Learning Study for a Mobile Smoking Cessation Program

NCT04857515
View directory record Official record
Conditions
Smoking Cessation, Smoking Behaviors, Smoking Reduction, Smoking, Cigarette, Smoking, Nicotine Dependence
Interventions
Clickotine®
Device
Lead sponsor
Click Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 17, 2021 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Feasibility and Acceptability of a Text Messaging Intervention to Increase Smoking Cessation in Vietnam

NCT03219541
View directory record Official record
Conditions
Smoking
Interventions
Interventional Automated mobile phone text, Control Automated mobile phone text
Behavioral
Lead sponsor
NYU Langone Health
Other
Eligibility
21 Years and older
Enrollment
190 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 17, 2020 · Synced Oct 19, 2026, 7:40 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Eye Tracking as a Biomarker of Cannabis Effects

NCT04100590
View directory record Official record
Conditions
Cannabis Use, Pain, Acute
Interventions
Cannabis
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
21 Years to 55 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 30, 2022 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Phase 4 Interventional Results available

Novel Pharmacotherapy Approaches in Smokers With Serious Mental Illness

NCT04011280
View directory record Official record
Conditions
Bipolar Disorder, Schizophrenia, Schizoaffective Disorder, Nicotine Dependence
Interventions
Varenicline
Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years to 70 Years
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jun 22, 2023 · Synced Oct 19, 2026, 7:40 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Role of Flavor in the Substitutability of E-cigarettes for Combustible Cigarettes Among Persistent Smokers

NCT06264154
View directory record Official record
Conditions
Smoking, Tobacco Use, Cigarette Smoking, E-Cig Use
Interventions
E-cigarettes
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
21 Years and older
Enrollment
210 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 19, 2026 · Synced Oct 19, 2026, 7:40 PM EDT
Completed No phase listed Observational

Role of an E-cigarette on Smoking Displacement in Smokers With Schizophrenia

NCT03075202
View directory record Official record
Conditions
Schizophrenia and Related Disorders
Interventions
e-cigarette, brand name JUUL
Device
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
21 Years to 65 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 11, 2019 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

E-cigarette Switching Older Adults

NCT06534905
View directory record Official record
Conditions
Tobacco Use, Opioid Use Disorder, Tobacco-Related Disorders
Interventions
E-cigarette, Control/Standard Advice
Other · Behavioral
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
50 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 10, 2026 · Synced Oct 19, 2026, 7:40 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Cardiovascular Disease Biomarkers in Smokers and Moist Snuff Consumers

NCT01692353
View directory record Official record
Conditions
Cardiovascular Disease, Cigarette Smoking
Interventions
Subject's usual brand (UB) tobacco product
Other
Lead sponsor
R.J. Reynolds Tobacco Company
Industry
Eligibility
26 Years to 49 Years · Male only
Enrollment
168 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2009
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Feb 17, 2016 · Synced Oct 19, 2026, 7:40 PM EDT
Not listed Phase 2 Interventional

Computer-Assisted Stop-Smoking Program in Helping Doctors Counsel Patients Who Smoke Cigarettes

NCT00865553
View directory record Official record
Conditions
Tobacco Use Disorder
Interventions
computer-assisted smoking cessation intervention, cancer prevention, educational intervention, survey administration
Behavioral · Other
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older
Enrollment
630 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2009
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Sep 20, 2013 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

E-cigarettes and Blood Vessel Function

NCT02740595
View directory record Official record
Conditions
Nicotine Dependence
Interventions
one time exposure to e-cig with nicotine, one time exposure to e-cig without nicotine, one time exposure to empty e-cig
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 45 Years
Enrollment
148 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Oct 5, 2023 · Synced Oct 19, 2026, 7:40 PM EDT
Recruiting Phase 2 Interventional

Breathe Easier With Tadalafil Therapy for Dyspnea in COPD-PH

NCT05937854
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease, Pulmonary Hypertension, Dyspnea
Interventions
Tadalafil, Placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
35 Years to 89 Years
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
5
States / cities
Aurora, Colorado • Decatur, Georgia • Boston, Massachusetts + 2 more
Source: ClinicalTrials.gov public record
Updated May 15, 2026 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comparison of Nicotine Plasma Concentrations and Subjective Effects for Three Electronic Cigarettes vs Combustible Cigarettes and Nicotine Gum

NCT02269514
View directory record Official record
Conditions
Smoking
Interventions
Own Brand Cigarette, Electronic Cigarette #1, Electronic Cigarette #2, Electronic Cigarette #3, Leading U.S. Nicotine Gum
Other
Lead sponsor
R.J. Reynolds Vapor Company
Industry
Eligibility
21 Years to 60 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Jun 4, 2018 · Synced Oct 19, 2026, 7:40 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Association Between Smoking, Brain Activity, Genes, and ADHD

NCT00915798
View directory record Official record
Conditions
Smoking, Withdrawal Nicotine, ADHD
Interventions
Cigarette smoking, Abstinence
Behavioral
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years to 45 Years
Enrollment
89 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2016
U.S. locations
1
States / cities
Santa Ana, California
Source: ClinicalTrials.gov public record
Updated Jan 13, 2017 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Phase 1 Interventional

Alcohol and Cigarette Craving During Oxytocin Treatment

NCT04071119
View directory record Official record
Conditions
Alcohol Use Disorder, Smoking
Interventions
Oxytocin nasal spray, Placebo
Drug
Lead sponsor
Brown University
Other
Eligibility
18 Years to 55 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated May 14, 2024 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Cardiovascular Assessment of the Effects of Tobacco and Nicotine Delivery Products

NCT01964807
View directory record Official record
Conditions
Adverse Effect of Other Agents Primarily Affecting the Cardiovascular System, Initial Encounter
Interventions
Cigarette, NIDA test type with 16.6 mg nicotine, Cigarette, NIDA test type with <0.45 mg nicotine, Electronic cigarette with 18 mg/ml nicotine, Electronic Cigarette with no nicotine, Moist snuff, Sham Smoking, Secondhand cigarette smoke (SHS), Conditioned, filtered air, Sham Moist Snuff
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 50 Years
Enrollment
81 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2021
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Dec 27, 2021 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Results available

Varenicline and Motivational Advice for Smokers With Substance Use Disorders

NCT00756275
View directory record Official record
Conditions
Smoking Cessation, Nicotine Dependence
Interventions
Nicotine Replacement Treatment (NRT), varenicline, Behavioral counseling for smoking cessation
Drug · Behavioral
Lead sponsor
Brown University
Other
Eligibility
18 Years to 75 Years
Enrollment
158 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Aug 27, 2018 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Phase 2 Interventional Results available

Adaptive Pharmacotherapy for Smoking Cessation

NCT02501265
View directory record Official record
Conditions
Nicotine Dependence
Interventions
Varenicline Standard Protocol, Nicotine Patch Standard Protocol, Varenicline Adaptive Protocol, Nicotine Adaptive Protocol
Behavioral · Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
188 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Aug 19, 2021 · Synced Oct 19, 2026, 7:40 PM EDT
Terminated Phase 4 Interventional Results available

e-Cigarettes Versus NRT Gum for Smoking Cessation

NCT01925781
View directory record Official record
Conditions
Nicotine Addiction, Smoking Cessation
Interventions
Nicotine polacrilex, STAM 1100mAh CE4 eGo Clearomizer
Drug · Other
Lead sponsor
Creighton University
Other
Eligibility
19 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 14, 2016 · Synced Oct 19, 2026, 7:40 PM EDT
Recruiting Phase 2 Interventional

Examining the Effects of Cytisinicline on Neural Substrates of Cigarette Cue-reactivity

NCT06617312
View directory record Official record
Conditions
Smoking Cessation, Tobacco Use Disorder
Interventions
Cytisinicline, Placebo Oral Capsule
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 65 Years
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 3, 2025 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Human Perception of Odors and Odor Blockers

NCT06191419
View directory record Official record
Conditions
Tobacco Smoking, Smoking Behaviors
Interventions
Odorants
Other
Lead sponsor
Tim McClintock
Other
Eligibility
18 Years to 60 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 23, 2026 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Combination of E-cigarettes and Varenicline for Tobacco Harm Reduction

NCT04210180
View directory record Official record
Conditions
Smoking Cessation, Harm Reduction
Interventions
Varenicline, e-cigarette
Drug · Other
Lead sponsor
Rose Research Center, LLC
Industry
Eligibility
21 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
2
States / cities
Charlotte, North Carolina • Raleigh, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 24, 2022 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Electronic Cigarette Use on the Lungs

NCT02596685
View directory record Official record
Conditions
Current Smoker, Never Smoker, Tobacco Use Disorder, Former Smoker, E-cig User
Interventions
Bronchoscopy, Electronic Cigarette, Laboratory Biomarker Analysis, Questionnaire Administration
Procedure · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
21 Years to 45 Years
Enrollment
142 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2021
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 30, 2024 · Synced Oct 19, 2026, 7:40 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Examining Brain Responses Linked to Emotion in Individuals Who Smoke Cigarettes

NCT04310735
View directory record Official record
Conditions
Smoking, Tobacco
Interventions
Verbal smoking expectancy manipulation
Behavioral
Lead sponsor
Penn State University
Other
Eligibility
21 Years to 55 Years
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
1
States / cities
University Park, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 7, 2025 · Synced Oct 19, 2026, 7:40 PM EDT