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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Smoking Reduction Clear all
Completed Not applicable Interventional Results available

Switching to Potential Reduced Exposure Products in Adult Smokers

NCT04250727
View directory record Official record
Conditions
Tobacco Use Disorder, Oral Nicotine Pouch Use, Smoking Behaviors, Harm Reduction, Toxic Effect of Tobacco and Nicotine, Carcinogenesis
Interventions
ZYN
Device
Lead sponsor
Yale University
Other
Eligibility
21 Years to 77 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Apr 30, 2024 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Project 3, Study 2: Extended Exposure to Low Nicotine Content Cigarettes in People With Current Affective Disorders

NCT02232737
View directory record Official record
Conditions
Tobacco Use Disorder
Interventions
Very low nicotine content cigarettes
Other
Lead sponsor
Brown University
Other
Eligibility
18 Years to 70 Years
Enrollment
775 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
2
States / cities
Providence, Rhode Island • Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Dec 6, 2022 · Synced Jul 22, 2026, 9:46 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 Jul 22, 2026, 9:46 PM EDT
Recruiting Phase 2 Interventional

E-Cigarettes for Harm Reduction in Smokers With Opioid Use Disorder

NCT05722561
View directory record Official record
Conditions
Opioid Use Disorder, Cigarette Smoking
Interventions
Telehealth Motivational Counseling, Nicotine Replacement Product, National Institute on Drug Abuse (NIDA) Standardized Research Electronic Cigarette (SREC).
Behavioral · Drug · Device
Lead sponsor
NYU Langone Health
Other
Eligibility
21 Years to 75 Years
Enrollment
302 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
2
States / cities
New York, New York • The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Mar 10, 2026 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pilot Study to Evaluate the Safety and Efficacy of Ariva® Silver Wintergreen in Reducing Cigarette Craving in Smokers

NCT01337830
View directory record Official record
Conditions
Tobacco Use Disorder, Smoking
Interventions
Ariva® Silver Wintergreen, Silver Wintergreen
Other
Lead sponsor
Star Scientific, Inc
Industry
Eligibility
23 Years to 72 Years
Enrollment
111 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Martinsburg, West Virginia
Source: ClinicalTrials.gov public record
Updated Oct 23, 2014 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional

Not Quite Ready to Quit

NCT01866722
View directory record Official record
Conditions
Smoking Cessation
Interventions
Usual care, Reduction, 5Rs
Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older
Enrollment
560 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Jul 30, 2017 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Development of a Mindfulness-Based Treatment for the Reduction of Alcohol Use and Smoking Cessation

NCT03734666
View directory record Official record
Conditions
Tobacco Use, Alcohol Use, Unspecified
Interventions
Mindfulness Based Relapse Prevention - Smoking and Alcohol, Cognitive Behavioral Therapy
Behavioral
Lead sponsor
H. Lee Moffitt Cancer Center and Research Institute
Other
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Jan 14, 2026 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Pilot Study to Evaluate Safety and Efficacy of CigRx™ in Smokers

NCT01262170
View directory record Official record
Conditions
Smoking, Tobacco Use Disorder
Interventions
CigRx Lozenge, Tobacco Lozenge
Dietary Supplement · Other
Lead sponsor
Rock Creek Pharmaceuticals, Inc.
Industry
Eligibility
23 Years to 72 Years
Enrollment
109 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Martinsburg, West Virginia
Source: ClinicalTrials.gov public record
Updated Oct 29, 2015 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Jail-Based Use of Smoking Cessation Treatment Study

NCT03799315
View directory record Official record
Conditions
Tobacco Use
Interventions
Nicotine Replacement Therapy, Counseling
Drug · Behavioral
Lead sponsor
Hennepin Healthcare Research Institute
Other
Eligibility
18 Years to 64 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 13, 2020 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Phase 2 Interventional Results available

Reduced-Dose Intensity-Modulated Radiation Therapy With or Without Cisplatin in Treating Patients With Advanced Oropharyngeal Cancer

NCT02254278
View directory record Official record
Conditions
Stage III Oropharyngeal Squamous Cell Carcinoma, Stage IVA Oropharyngeal Squamous Cell Carcinoma, Stage IVB Oropharyngeal Squamous Cell Carcinoma, Stage IVC Oropharyngeal Squamous Cell Carcinoma, Tongue Carcinoma
Interventions
Cisplatin, IMRT 6 weeks, IMRT 5 weeks
Drug · Radiation
Lead sponsor
NRG Oncology
Other
Eligibility
18 Years and older
Enrollment
316 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2025
U.S. locations
207
States / cities
Birmingham, Alabama • Gilbert, Arizona • Tucson, Arizona + 168 more
Source: ClinicalTrials.gov public record
Updated May 21, 2026 · Synced Jul 22, 2026, 9:46 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Effectiveness of Using Reduced Nicotine Cigarettes in Men and Women Smokers to Combat Nicotine Addiction

NCT00264342
View directory record Official record
Conditions
Nicotine Dependence, Tobacco Use Disorder
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 70 Years
Enrollment
135 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2010
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 22, 2013 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional

Project 2: Strategies for Reducing Nicotine Content in Cigarettes

NCT02139930
View directory record Official record
Conditions
Nicotine Dependence, Tobacco Smoking
Interventions
Normal Nicotine Control Group, Immediate Nicotine Reduction Group, Gradual Nicotine Reduction Group
Behavioral
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
1,250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
10
States / cities
Phoenix, Arizona • San Francisco, California • Tampa, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2018 · Synced Jul 22, 2026, 9:46 PM 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 Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional

LUNGevity: Lung Cancer Stigma Community Based Participatory Research

NCT06286592
View directory record Official record
Conditions
Lung Cancer
Interventions
Ultra-brief mindfulness intervention video, Forgiveness video, ACT values video
Behavioral
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Piscataway, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Combined Treatment for Tobacco and Alcohol Use in Puerto Rico

NCT00570804
View directory record Official record
Conditions
Smoking
Interventions
Telephone Counseling, Telephone Assessments
Behavioral
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
370 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2021
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 27, 2021 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Results available

A Test of Short and Long Term Naturalistic Outcomes of Smokers Who Sample Smokeless Tobacco

NCT01509586
View directory record Official record
Conditions
Smoking, Smoking Cessation
Interventions
Potentially Reduced Exposure Product (PREP): a smokeless, spit-free tobacco product
Drug
Lead sponsor
Medical University of South Carolina
Other
Eligibility
19 Years and older
Enrollment
1,236 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 11, 2023 · Synced Jul 22, 2026, 9:46 PM 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 Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Impact of New Standards for Tobacco Products Among Dual E-Cigarette/Combusted Cigarette Users - Project 2

NCT05473585
View directory record Official record
Conditions
Smoking, Smoking, Cigarette, E-Cig Use, Nicotine Dependence
Interventions
very low nicotine content cigarettes, normal nicotine content cigarettes, Study e-cigarette
Other
Lead sponsor
Duke University
Other
Eligibility
21 Years and older
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 18, 2023 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Results available

Smoking Cessation Pilot for People Living With HIV (PLWH)

NCT04808609
View directory record Official record
Conditions
Smoking Cessation, Smoking, Smoking Behaviors, Smoking Reduction, Smoking, Tobacco, Smoking, Cigarette, Hiv, HIV/AIDS
Interventions
Lumme mobile phone application, Standard of Care
Device · Behavioral
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 22, 2023 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Reducing Tobacco Use Disparities Among Low-Income Adults

NCT03077737
View directory record Official record
Conditions
Cigarette Smoking, Nicotine Dependence
Interventions
Choose to Change, Enhanced usual care
Behavioral
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
190 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 20, 2022 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Phase 3 Interventional

Reducing Ethnic Health Disparities: Motivating HIV+ Latinos to Quit Smoking

NCT00503230
View directory record Official record
Conditions
Tobacco Dependence, HIV Infections
Interventions
Standard Care Intervention (SCI), Culturally Tailored Intervention (CTI)
Behavioral
Lead sponsor
Butler Hospital
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2011
U.S. locations
8
States / cities
Lowell, Massachusetts • New Bedford, Massachusetts • Roxbury, Massachusetts + 3 more
Source: ClinicalTrials.gov public record
Updated May 2, 2013 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional

ROSCAP: Reduction of Smoking in Cardiac Patients Study

NCT00301626
View directory record Official record
Conditions
Nicotine Dependence, Tobacco Dependence, Cardiac Disease
Interventions
smoking reduction intervention (including NRT)
Behavioral
Lead sponsor
National Institutes of Health (NIH)
NIH
Eligibility
18 Years to 80 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2005
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 23, 2008 · Synced Jul 22, 2026, 9:46 PM EDT
Recruiting Phase 4 Interventional

Modifying Progesterone and Estradiol Levels to Prevent Postpartum Cigarette Smoking Relapse and Reduce Secondhand Smoke Exposure in Infants and Children

NCT04783857
View directory record Official record
Conditions
Smoking, Smoking Cessation, Smoking Reduction
Interventions
Progesterone 200 MG Oral Capsule
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
171 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Jul 22, 2026, 9:46 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Reducing Cancer Disparities Among Latinos in Texas

NCT01504919
View directory record Official record
Conditions
Psychosocial Problem
Interventions
Health Education, Questionnaires, Telephone Counseling Sessions, Nicotine Patches
Behavioral · Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
301 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2022
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 30, 2022 · Synced Jul 22, 2026, 9:46 PM EDT