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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Study e-cigarette Clear all
Terminated Phase 1 Interventional Accepts healthy volunteers

Hookah Smoking, Carbon Monoxide, and Coronary Endothelial Function

NCT03166787
View directory record Official record
Conditions
Smoking, Endothelial Dysfunction
Interventions
Charcoal hookah, E-coal hookah, Cigarette, Carbon Monoxide inhalation, Room Air inhalation, vitamin C, tadalafil
Other · Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
21 Years to 49 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 8, 2021 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

A Study to Evaluate the Pharmacokinetic Profiles of Cigarettes and E-Cigarettes With Nicotine Salt Formulations

NCT03822546
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Conventional cigarette, myblu 25 mg freebase, myblu 16 mg nicotine salt, myblu 25 mg nicotine salt, myblu 40 mg nicotine salt, blu PRO 48 mg nicotine salt
Other
Lead sponsor
Fontem Ventures BV
Industry
Eligibility
25 Years to 65 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Lincoln, Nebraska
Source: ClinicalTrials.gov public record
Updated Jan 29, 2019 · Synced Sep 13, 2026, 2:42 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Effects of E-cigarettes (ECIGs) on Pulmonary Inflammation and Behavior in HIV Infected Smokers

NCT02848586
View directory record Official record
Conditions
Lung Inflammation, HIV Seropositivity
Interventions
ECIGS, mobile contingency management (mCM), Usual brand
Other · Behavioral
Lead sponsor
Duke University
Other
Eligibility
18 Years to 64 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 10, 2023 · Synced Sep 13, 2026, 2:42 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

E-cigarette Cessation in Adults Who Co-use Cannabis

NCT06688539
View directory record Official record
Conditions
Nicotine Dependence, Tobacco Use Disorder
Interventions
Varenicline Pill, Contingency management, Counseling
Drug · Behavioral
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 40 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
3
States / cities
Charleston, South Carolina • Lancaster, South Carolina • Pickens, South Carolina
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Sep 13, 2026, 2:42 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Switch or Quit R01

NCT06373679
View directory record Official record
Conditions
Cigarette Smoking, Smoking Behaviors
Interventions
Switching to E-Cigarette, Switching using Medication
Behavioral
Lead sponsor
Medical University of South Carolina
Other
Eligibility
21 Years and older
Enrollment
225 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

E-cigarette Nicotine Study

NCT04709471
View directory record Official record
Conditions
Nicotine Dependence, Electronic Cigarette Use, Cigarette Smoking
Interventions
Nicotine, Juul e-cigarette, Reduction
Drug · Device · Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
21 Years and older
Enrollment
77 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Aug 25, 2022 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nicotine and Tobacco Message Framing to Change Smoking Behavior in Diverse Groups of Young Adult Smokers

NCT06644664
View directory record Official record
Conditions
Tobacco-Related Carcinoma
Interventions
Health Education, Interview, Smoking Cessation Intervention, Survey Administration, Text Message-Based Navigation Intervention
Behavioral · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years to 35 Years
Enrollment
292 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Sep 13, 2026, 2:42 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Pilot Study of the YES-CAN! Program to Prevent Youth Nicotine Vaping

NCT07009509
View directory record Official record
Conditions
Nicotine Vaping
Interventions
YES-CAN! program
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
9 Years and older
Enrollment
1,166 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 14, 2025 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

E-Cigarettes and Financial Incentives to Promote Tobacco Harm Reduction Among Adults Accessing Shelter Services

NCT03743532
View directory record Official record
Conditions
Cigarette Smoking
Interventions
E-cigarette Switching, Financial Incentives
Behavioral
Lead sponsor
University of Oklahoma
Other
Eligibility
21 Years to 100 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Feb 20, 2025 · Synced Sep 13, 2026, 2:42 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 18, 2026 · Synced Sep 13, 2026, 2:42 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 26, 2025 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Do Flavors Increase the Addiction Potential of Nicotine?

NCT04696380
View directory record Official record
Conditions
Nicotine Dependence
Interventions
Nicotine, JUUL e-cigarette
Drug · Device
Lead sponsor
University of Vermont
Other
Eligibility
21 Years and older
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Mar 21, 2022 · Synced Sep 13, 2026, 2:42 PM EDT
Recruiting Phase 3 Interventional Accepts healthy volunteers

Switching to E-cigarettes in Smokers Not Interested in Quitting

NCT05703672
View directory record Official record
Conditions
Smoking Reduction
Interventions
Varenicline Tartrate, Placebo, Electronic cigarette
Drug · Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
21 Years and older
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
2
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Dec 28, 2025 · Synced Sep 13, 2026, 2:42 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 14, 2015 · Synced Sep 13, 2026, 2:42 PM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

The Acute Cardiovascular Effects of Nicotine in E-cigarettes (ACE) Study

NCT03010995
View directory record Official record
Conditions
Cigarette Smoking Toxicity, Nicotine, Acute Cardiovascular Disease
Interventions
Prazosin
Drug
Lead sponsor
University of Louisville
Other
Eligibility
18 Years to 40 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 25, 2018 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of E-Cigarette Nicotine Content in Smokers (Nicotine Flux Study)

NCT04332926
View directory record Official record
Conditions
Electronic Cigarette Use
Interventions
Tobacco product administration and assessment, own brand cigarettes, Tobacco product administration and assessment, ECIG 30 Watts, 0 mg/ml nicotine, Tobacco product administration and assessment, ECIG 30 Watts, 8 mg/ml nicotine, Tobacco product administration and assessment, ECIG 30 Watts, 15 mg/ml nicotine, Tobacco product administration and assessment, ECIG 30 Watts, 30 mg/ml nicotine
Other
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 55 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 12, 2025 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Short-Term Cardiovascular Effects of E-Cigarettes: Influence of Device Power

NCT03839745
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 and older
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
2
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 30, 2024 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional

Respiratory Effects of E-Cigarettes in Obese Youth

NCT05869318
View directory record Official record
Conditions
E-Cig Use
Interventions
ECIG own, ECIG Vuse
Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
21 Years to 25 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 8, 2026 · Synced Sep 13, 2026, 2:42 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 9, 2019 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Ventilation and Pulmonary Endothelium Toxicities of E-cigarettes: A Randomized Crossover Pilot Study

NCT02783768
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive, E-cigarettes
Interventions
E-cigarette, Sham, Hyperpolarized 3-Helium, Gadolinium
Device · Other · Drug
Lead sponsor
Columbia University
Other
Eligibility
21 Years to 35 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 21, 2020 · Synced Sep 13, 2026, 2:42 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Effects of Tobacco Flavoring and Liquid Composition on Vaping Topography

NCT05876091
View directory record Official record
Conditions
Tobacco-Related Carcinoma
Interventions
Vaping, Biospecimen Collection, Questionnaire Administration
Other · Procedure
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
21 Years to 55 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Dec 21, 2025 · Synced Sep 13, 2026, 2:42 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Characterize the Nicotine Uptake and Subjective Effects With Use of JUUL Electronic Nicotine Delivery Systems

NCT04123041
View directory record Official record
Conditions
Electronic Cigarette Use, Tobacco Smoking
Interventions
JUUL ENDS, Combustible cigarette, comparator e-cigarette, Nicorette gum
Other
Lead sponsor
Juul Labs, Inc.
Industry
Eligibility
21 Years to 65 Years
Enrollment
137 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
2
States / cities
Kansas City, Kansas • Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Feb 12, 2020 · Synced Sep 13, 2026, 2:42 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Neuroimaging Approaches to Improve Prediction of Smoking Initiation and Nicotine Escalation in Young Adult ENDS Users

NCT05447325
View directory record Official record
Conditions
Message Exposure (Sequence: Regular Then Flavor), Message Exposure (Sequence: Flavor Then Regular), No Message Exposure (Control Condition)
Interventions
Exposure to Anti-Vaping Messages (generic themes then flavor-specific themes), Exposure to Anti-Vaping Messages (flavor-specific themes then generic themes), Exposure to Anti-Vaping Messages (no message exposure)
Behavioral
Lead sponsor
University of Georgia
Other
Eligibility
18 Years to 29 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Athens, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 13, 2026, 2:42 PM EDT
Not yet recruiting Not applicable Interventional

Impact of Electronic Cigarette Temperature and Solvent on Biomarkers

NCT07612696
View directory record Official record
Conditions
Oxidative Stress, Tobacco Use, Electronic Cigarettes
Interventions
High temperature wattage setting on electronic cigarette, Low temperature wattage setting on electronic cigarette, High concentration of Propylene Glycol, Low concentration of Propylene Glycol
Other
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
21 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 13, 2026, 2:42 PM EDT