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ClinicalTrials.gov public records Last synced Oct 20, 2026, 10:52 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–24 of 39 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Cig Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Reactions to E-cigs and Alcohol

NCT03449017
View directory record Official record
Conditions
Alcohol Abuse, Nicotine Dependence Tobacco Product
Interventions
E-cig use
Behavioral
Lead sponsor
Indiana University
Other
Eligibility
21 Years and older
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Nov 29, 2018 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

JUUL vs. Mod E-cigarette Study

NCT04237272
View directory record Official record
Conditions
Smoking, Tobacco Use
Interventions
Pod System E-cig, Customizable Tank E-cig, Control
Other
Lead sponsor
Medical University of South Carolina
Other
Eligibility
21 Years and older
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Dec 21, 2022 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Nicotine Pharmacokinetics Following Use of the P4M3 Gen 2.0 E-Cigarette Compared to Smoking Cigarettes

NCT05383508
View directory record Official record
Conditions
Nicotine Vaping, Nicotine, Vaping
Interventions
CA35, CM35, Cig
Other
Lead sponsor
Philip Morris Products S.A.
Industry
Eligibility
24 Years to 65 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
High Point, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 26, 2024 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Assess Biomarkers of Tobacco Exposure and Nicotine Pharmacokinetics in Smokers After a 5-Day In-Clinic Confinement Switch to an Electronic Cigarette or Nicotine Gum

NCT02323438
View directory record Official record
Conditions
Smoking
Interventions
Usual Brand Cigarette, Electronic Cigarette #1, Electronic Cigarette #2, Leading U.S. Nicotine Gum
Other
Lead sponsor
R.J. Reynolds Vapor Company
Industry
Eligibility
21 Years to 60 Years
Enrollment
153 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 1, 2018 · Synced Oct 20, 2026, 10:52 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Comparison of Pharmacokinetic Parameters Between Adopters of Electronic Cigarettes and a Historical Sample of Combustible Cigarette Smokers

NCT02730676
View directory record Official record
Conditions
Smoking
Interventions
Electronic Cigarette #1, Electronic Cigarette #2
Other
Lead sponsor
R.J. Reynolds Vapor Company
Industry
Eligibility
21 Years to 60 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Lakewood, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 1, 2018 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Short-Term Cardiovascular Effects of E-Cigarettes: Influence of E-Liquid pH

NCT04449510
View directory record Official record
Conditions
Cardiovascular Risk Factor, Nicotine Dependence
Interventions
Electronic Cigarette
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years to 70 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
2
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jul 15, 2025 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Low Nicotine Content Cigarettes in Vulnerable Populations: Affective Disorders

NCT04090879
View directory record Official record
Conditions
Tobacco Use Disorder
Interventions
Either normal nicotine content cigarettes (15.8mg/g) or reduced nicotine content cigarettes (0.4mg/g), E-Cigarettes
Other
Lead sponsor
Brown University
Other
Eligibility
18 Years to 70 Years
Enrollment
326 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
2
States / cities
Providence, Rhode Island • Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Apr 1, 2025 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

BRP1602: Evaluation of Technical and Logistical Feasibility to Measure Lung Permeability

NCT06105424
View directory record Official record
Conditions
Tobacco Use, Smoking, Smoking, Tobacco
Interventions
Lung Permeability Assessment
Procedure
Lead sponsor
RAI Services Company
Industry
Eligibility
30 Years to 50 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 27, 2023 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Sex Differences in E-cig Perception: Study 1

NCT05432830
View directory record Official record
Conditions
Nicotine Addiction, E-Cig Use, Cigarette Smoking, Sex Differences
Interventions
E-liquid Flavor 1, E-liquid Flavor 2, E-liquid Flavor 3
Other
Lead sponsor
Yale University
Other
Eligibility
21 Years to 44 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 2, 2026 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Clinical Pharmacology of Electronic Cigarettes

NCT02470754
View directory record Official record
Conditions
Nicotine Dependence
Interventions
Tobacco Cigarette, Electronic Cigarette
Device
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years and older
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
2
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 22, 2023 · Synced Oct 20, 2026, 10:52 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Impact of Chronic E-Cigarette Usage on Microvascular Health

NCT06860698
View directory record Official record
Conditions
E-Cig Use
Interventions
E-cig use
Other
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 29 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2025
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Oct 20, 2026, 10:52 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

E-Cigarettes: Dynamic Patterns of Use and Health Effects

NCT02527980
View directory record Official record
Conditions
Smoking, Nicotine Dependence
Interventions
No intervention: observation only
Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 99 Years
Enrollment
422 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
2
States / cities
Madison, Wisconsin • Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Dec 10, 2019 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Gender Differences in Switching From Smoking Regular Cigarettes to E-Cigarettes

NCT03856515
View directory record Official record
Conditions
Cigarette Smoking-Related Carcinoma
Interventions
Nicotine Replacement, Questionnaire Administration, Electronic Cigarette
Drug · Other · Device
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
21 Years and older
Enrollment
169 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Pharmacokinetic Study Comparing Nicotine Delivery From E-cigarettes and a Conventional Cigarette in Healthy Subjects

NCT02474849
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Use electronic cigarette or smoke conventional cigarette
Other
Lead sponsor
British American Tobacco (Investments) Limited
Industry
Eligibility
21 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Burbank, California
Source: ClinicalTrials.gov public record
Updated Sep 15, 2015 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Clinical Outcomes of a Nationwide, Naturalistic E-Cig Trial (CONNECT)

NCT03453385
View directory record Official record
Conditions
Smoking, Tobacco Use
Interventions
Electronic Cigarette
Behavioral
Lead sponsor
Medical University of South Carolina
Other
Eligibility
21 Years and older
Enrollment
638 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Sep 11, 2023 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Does Switching to Nicotine Containing Electronic Cigarettes Reduce Health Risk Markers

NCT03625986
View directory record Official record
Conditions
Tobacco Dependence
Interventions
Nicotine-Containing Electronic Cigarette, Non-Nicotine Electronic Cigarette
Other
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
21 Years to 70 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 27, 2025 · Synced Oct 20, 2026, 10:52 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

In-vivo Effects of E-cigarette Aerosol on Innate Lung Host Defense

NCT03700892
View directory record Official record
Conditions
Smoking, Healthy
Interventions
Cinnamaldehyde e-liquid, PG/VG e-liquid
Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 40 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 10, 2021 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

ECigs, Inflammation and Oxidative Stress

NCT03823885
View directory record Official record
Conditions
E-cigarettes, Oxidative Stress, Inflammation
Interventions
e-cigarette, empty (-cigarette sham control)
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 45 Years
Enrollment
148 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Results available

Changes in Biomarkers Associated With Use of Electronic Cigarettes

NCT03084315
View directory record Official record
Conditions
Biomarkers
Interventions
E-Cig Zero Nicotine, E-Cig 24mg Nicotine
Device
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
234 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Aug 26, 2021 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Middle School Cluster Randomized Controlled Trial (RCT) to Evaluate E-Cigarette Prevention Program: CATCH My Breath

NCT04843501
View directory record Official record
Conditions
E-cigarette Use
Interventions
CATCH My Breath (CMB) program for E-cigarette prevention among adolescents, Texas Education Agency (TEA) required tobacco prevention program
Behavioral
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
10 Years to 15 Years
Enrollment
2,059 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Feb 6, 2026 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Behavioral Pharmacology of Cannabis and Nicotine

NCT04124432
View directory record Official record
Conditions
Cannabis, Nicotine
Interventions
Cannabis, Nicotine
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 55 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 17, 2024 · Synced Oct 20, 2026, 10:52 PM EDT
Not yet recruiting Phase 4 Interventional

Evaluating an Innovative Tobacco Treatment Approach for Veterans in Substance Use Treatment

NCT07809854
View directory record Official record
Conditions
Cigarette Smoking, Veterans
Interventions
Healthy Changes Nicotine Replacement Therapy (NRT), Cessation Treatment Nicotine Replacement Therapy (NRT), Cessation Treatment Counseling, Healthy Changes Counseling
Drug · Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
112 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2031
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Oct 20, 2026, 10:52 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

E-cigarettes, Nicotine Inhaler, and Blood Vessel Function

NCT03072628
View directory record Official record
Conditions
Nicotine Dependence
Interventions
e-cig with nicotine, e-cig without nicotine, nicotine inhaler, sham control
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 45 Years
Enrollment
148 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Oct 20, 2026, 10:52 PM EDT
Recruiting Not applicable Interventional

Effects of E-cigs vs Pouches on Cigarette Smoking and Addiction

NCT06077240
View directory record Official record
Conditions
Smoking, Smoking Behaviors, Nicotine Dependence
Interventions
E-cigarette with 2.4% Nicotine with Menthol and Tobacco Flavors, E-cigarette with 2.4% Nicotine with Tobacco Flavor Only, E-cigarette with 5% Nicotine with Menthol and Tobacco Flavors, E-cigarette with 5% Nicotine with Tobacco Flavor Only, Tobacco Pouches with 3mg Nicotine with Menthol and Tobacco Flavors, Tobacco Pouches with 3mg Nicotine with Tobacco Flavor Only, Tobacco Pouches with 6mg Nicotine with Menthol and Tobacco Flavors, Tobacco Pouches with 6mg Nicotine with Tobacco Flavor Only
Behavioral
Lead sponsor
Yale University
Other
Eligibility
21 Years and older
Enrollment
256 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced Oct 20, 2026, 10:52 PM EDT