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Showing 1–24 of 180 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Condition: Smoking Reduction Clear all
Not listed Phase 1 Interventional Accepts healthy volunteers

Step-up to Quit: Using Low-to-moderate Intensity Exercise for Reducing Smoking Cue Reactivity Among Low-income Smokers

NCT02220465
View directory record Official record
Conditions
Sedentary Lifestyle, Cigarette Smoking
Interventions
PA+ Smoking Cessation (LMPA), Standard Care Smoking Counseling (SCC)
Behavioral
Lead sponsor
Temple University
Other
Eligibility
18 Years to 59 Years
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 19, 2014 · Synced Sep 6, 2026, 7:56 AM 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 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Switching to Reduced Oxidant or Nicotine Content Cigarettes in Smokers

NCT02415270
View directory record Official record
Conditions
Tobacco Smoking Behavior
Interventions
Reduced Nicotine Cigarettes, Reduced ROS/RNS, Control
Other
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
21 Years to 65 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 26, 2018 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Comparisons of Nicotine-free Cigarettes, Extra Low Nicotine Cigarettes vs. Medicinal Nicotine

NCT00777569
View directory record Official record
Conditions
Tobacco Dependence
Interventions
Nicotine free cigarettes, Extra-low nicotine cigarettes, Nicotine Lozenge
Drug
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years to 70 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 15, 2017 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional

Computerized Anger-Reduction Treatment for Smoking Cessation

NCT02413814
View directory record Official record
Conditions
Anger, Smoking Cessation
Interventions
Anger Reduction Treatment, Control Condition
Behavioral
Lead sponsor
Florida State University
Other
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Jan 27, 2021 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Results available

E-cigarettes to Promote Smoking Reduction Among Individuals With Schizophrenia

NCT02918630
View directory record Official record
Conditions
Tobacco Smoking
Interventions
Nicotine Patch, E-cigarette
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 65 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 4, 2018 · Synced Sep 6, 2026, 7:56 AM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers

A Smoking Intervention Study Using Scheduled Gradual Reduction With Varenicline to Help With Cessation

NCT01772641
View directory record Official record
Conditions
Nicotine Addiction
Interventions
Scheduled Gradual Reduction + Varenicline, Scheduled Gradual Reduction + Placebo Drug, Basic Advice + Varenicline, Basic Advice + Placebo Drug
Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 15, 2016 · Synced Sep 6, 2026, 7:56 AM EDT
Recruiting Not applicable Interventional

E-cigarettes for Harm Reduction Among Smokers With Serious Mental Illness

NCT05815199
View directory record Official record
Conditions
Cigarette Smoking
Interventions
E-cigarette (EC), Nicotine Replacement Therapy (NRT), Harm-Reduction Counseling, Ecological Momentary Intervention (EMI) Text Messaging
Other · Behavioral
Lead sponsor
NYU Langone Health
Other
Eligibility
21 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 9, 2025 · Synced Sep 6, 2026, 7:56 AM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

App for Reducing Cravings to Smoke

NCT06088498
View directory record Official record
Conditions
Smoking
Interventions
Updating Existing Smartphone App, Quitline Services, Quitline Services and Smartphone App
Behavioral
Lead sponsor
H. Lee Moffitt Cancer Center and Research Institute
Other
Eligibility
18 Years and older
Enrollment
3,600 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Feb 8, 2026 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Testing the Efficacy of A Scalable, Telephone-Delivered, Guided Imagery Tobacco Cessation Intervention

NCT05277831
View directory record Official record
Conditions
Smoking Cessation, Smoking, Smoking Reduction, Smoking, Cigarette, Smoking (Tobacco) Addiction, Smoking Habit
Interventions
Guided Imagery Intervention, Standard Behavioral Control
Other
Lead sponsor
University of Arizona
Other
Eligibility
18 Years and older
Enrollment
1,209 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 23, 2025 · Synced Sep 6, 2026, 7:56 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

A RCT to Determine the Effect of ENDS Flavor Availability on Abstinence Within Smokers

NCT07172438
View directory record Official record
Conditions
Smoking, Tobacco
Interventions
P2611222, P2615022, P2615122, P2613422
Other
Lead sponsor
RAI Services Company
Industry
Eligibility
21 Years to 65 Years
Enrollment
668 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
27
States / cities
Chandler, Arizona • Fort Smith, Arkansas • Altamonte Springs, Florida + 21 more
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Sep 6, 2026, 7:56 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Noncombustible Nicotine Delivery Systems as Potential Harm Reduction Tools for Persistent Cigarette Smokers

NCT06372899
View directory record Official record
Conditions
E-cigarette Use, Cigarette Smoking, Harm Reduction, Tobacco Use
Interventions
E-cigarettes, Oral nicotine pouches
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
21 Years and older
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 11, 2026 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Assisting Smokers to Switch to a JUUL E-Cigarette by Devaluing Combustible Cigarettes

NCT04188197
View directory record Official record
Conditions
Smoking Cessation, Harm Reduction, E-Cig Use, Cigarette Smoking, Tobacco Dependence, Tobacco Use Cessation
Interventions
JUUL
Other
Lead sponsor
Rose Research Center, LLC
Industry
Eligibility
21 Years to 65 Years
Enrollment
50 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 Apr 19, 2025 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Evaluate the Safety and Efficacy of Dietary Supplement Anatabloc in Reducing Daily Smokers' Urge to Smoke

NCT01428310
View directory record Official record
Conditions
Tobacco Use Disorder, Tobacco Dependence, Smoking
Interventions
Anatabloc(TM), CigRx(R)
Dietary Supplement
Lead sponsor
Rock Creek Pharmaceuticals, Inc.
Industry
Eligibility
23 Years to 72 Years
Enrollment
109 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011
U.S. locations
1
States / cities
Martinsburg, West Virginia
Source: ClinicalTrials.gov public record
Updated Oct 29, 2015 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Reduced Exposure Study Using THS 2.2 Menthol With 5 Days in a Confinement Setting Followed by 86 Days in an Ambulatory Setting

NCT01989156
View directory record Official record
Conditions
Smoking
Interventions
THS 2.2 Menthol (mTHS 2.2), Menthol Conventional Cigarette (mCC), Smoking Abstinence (SA)
Other
Lead sponsor
Philip Morris Products S.A.
Industry
Eligibility
22 Years and older
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
2
States / cities
Daytona Beach, Florida • Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 23, 2020 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Reduced Nicotine Content Cigarettes in Smokers of Lower Socioeconomic Status

NCT01928719
View directory record Official record
Conditions
Tobacco Dependence
Interventions
Reduced Nicotine Content Cigarettes, Same Nicotine Content Cigarettes
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
280 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 30, 2019 · Synced Sep 6, 2026, 7:56 AM 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 23, 2022 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Adaptive Use of Nicotine Substitution to Maintain Smoking Reduction/Abstinence in Nicotine Responders

NCT06554873
View directory record Official record
Conditions
Smoking Cessation, Harm Reduction
Interventions
Nicoderm, Nicorette 4Mg Chewing Gum, Nicorette Lozenge Product, NJOY e-cigarette, on!
Drug · Other
Lead sponsor
Rose Research Center, LLC
Industry
Eligibility
22 Years to 65 Years
Enrollment
150 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
2
States / cities
Charlotte, North Carolina • Raleigh, North Carolina
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Sep 6, 2026, 7:56 AM EDT
Active, not recruiting Not applicable Interventional

Pilot Study of a Brain Health Program in Senior Centers

NCT07424443
View directory record Official record
Conditions
Memory Loss (Excluding Dementia), Lifestyle (Sedentary Behavior and Physical Activity), Lifestyle Risk Reduction, Healthy Lifestyle Behaviors, Dementia Prevention
Interventions
My Healthy Brain
Behavioral
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
50 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 14, 2026 · Synced Sep 6, 2026, 7:56 AM EDT
Recruiting Not applicable Interventional

Health Effects of the Standardized Research E-Cigarette in Smokers With HIV Smokers With HIV

NCT03862924
View directory record Official record
Conditions
HIV
Interventions
Standardized Research Electronic Cigarette
Device
Lead sponsor
Brown University
Other
Eligibility
18 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Jun 17, 2024 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Online Automated Self-Hypnosis Program

NCT03931772
View directory record Official record
Conditions
Smoking, Pain, Stress
Interventions
Automated Self-Hypnosis
Behavioral
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
152 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2022
U.S. locations
2
States / cities
Palo Alto, California • Stanford, California
Source: ClinicalTrials.gov public record
Updated Mar 19, 2023 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional

Feasibility and Efficacy of a Brief Mindfulness-Based Intervention SMOKING INTERVENTION VIA THE INTERNET

NCT04572126
View directory record Official record
Conditions
Substance Use, Smoking Reduction
Interventions
Mindfulness Intervention, Control Intervention
Behavioral
Lead sponsor
Wayne State University
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 10, 2022 · Synced Sep 6, 2026, 7:56 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

CONNECT Cancer Survivors With Tobacco Treatment

NCT07020273
View directory record Official record
Conditions
Tobacco Use, Tobacco Use Cessation, Smoking Cessation, Nicotine Addiction, Tobacco Smoking
Interventions
ELEVATE, ELEVATE-S
Behavioral
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
3,543 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 9, 2026 · Synced Sep 6, 2026, 7:56 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Switching to a Vaping Device: Evaluating Risk Reduction Among Quitline Treatment Failures

NCT03502200
View directory record Official record
Conditions
Smoking, Cigarette
Interventions
JUUL, Treatment As Usual
Device · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
21 Years to 99 Years
Enrollment
350 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 20, 2023 · Synced Sep 6, 2026, 7:56 AM EDT