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Showing 1–24 of 87 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Former Smokers Clear all
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Quit Smoking Study for People Who Use E-Cigarettes

NCT04946825
View directory record Official record
Conditions
Nicotine Addiction, E-Cig Use, Quitting Smoking
Interventions
Nicotine replacement therapy patch, Nicotine replacement therapy lozenge, Quit electronic cigarettes, Continue electronic cigarettes
Drug · Behavioral
Lead sponsor
University of Vermont
Other
Eligibility
18 Years to 29 Years
Enrollment
396 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated May 21, 2025 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Improving the Reach & Effectiveness of Smoking Cessation Services Targeted to Veterans Living With HIV

NCT04505371
View directory record Official record
Conditions
HIV Infections, Smoking, Smoking Cessation
Interventions
Wellness Intervention for Smokers with HIV
Behavioral
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years and older
Enrollment
235 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 30, 2026 · Synced Sep 2, 2026, 1:01 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Feasibility of Cell-Free DNA Liquid Biopsy in Screening High-Risk Patients for Lung Cancer

NCT05384769
View directory record Official record
Conditions
Lung Carcinoma
Interventions
Liquid Biopsy, Low Dose Computed Tomography of the Chest, Survey Administration
Procedure · Other
Lead sponsor
City of Hope Medical Center
Other
Eligibility
50 Years to 80 Years
Enrollment
108 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2029
U.S. locations
1
States / cities
Duarte, California
Source: ClinicalTrials.gov public record
Updated Oct 6, 2025 · Synced Sep 2, 2026, 1:01 PM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

A Smartphone Application (QuitBot) for the Improvement of Smoking Cessation Among American Indians and Alaska Natives, NAITIVE Trial

NCT06697496
View directory record Official record
Conditions
Cigarette Smoking-Related Carcinoma
Interventions
QuitBot Smoking Cessation Chatbot Program, QuitBot Smoking Cessation Text Messaging Program, Survey Administration, Interview, Carbon Monoxide Measurement
Device · Other · Procedure
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
772 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2030
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Imaging Regional Lung Defect Severity

NCT01640288
View directory record Official record
Conditions
COPD
Interventions
Perfluorinated Gas/Oxygen Mixture, High Resolution CT of the Chest
Drug · Other
Lead sponsor
Hal C Charles
Other
Eligibility
18 Years and older
Enrollment
171 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 16, 2020 · Synced Sep 2, 2026, 1:01 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Predictors of Teen Smoking-cessation

NCT01141517
View directory record Official record
Conditions
Cigarette Smoking
Interventions
Not-On-Tobacco smoking cessation program
Behavioral
Lead sponsor
Nationwide Children's Hospital
Other
Eligibility
13 Years to 19 Years
Enrollment
147 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2014
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 21, 2019 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Not applicable Interventional Results available

Implementation of Smoking Cessation Within NCI Community Oncology Research Program (NCORP) Sites

NCT03291587
View directory record Official record
Conditions
Smoking Cessation
Interventions
Personnel Training and Coaching Calls
Other
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
1,094 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
49
States / cities
Newark, Delaware • Augusta, Georgia • Savannah, Georgia + 36 more
Source: ClinicalTrials.gov public record
Updated Jul 24, 2022 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 3 Interventional

Efficacy and Safety of Rimonabant as an Aid to Maintenance of Smoking Cessation

NCT00459173
View directory record Official record
Conditions
Maintenance of Smoking Cessation
Interventions
rimonabant (SR141716)
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years and older
Enrollment
4,850 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2005
U.S. locations
1
States / cities
Bridgewater, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 6, 2009 · Synced Sep 2, 2026, 1:01 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Electronic Quitline Referral With Enhanced Academic Detailing for the Promotion of Smoking Cessation

NCT04969978
View directory record Official record
Conditions
Tobacco-Related Carcinoma, Smoking &Amp; Tobacco Cessation
Interventions
Enhanced Academic Detailing, Informational Intervention
Behavioral · Other
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
9,133 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 2 Interventional Results available

18F-FSPG PET/CT in Diagnosing Early Lung Cancer in Patients With Lung Nodules

NCT03824535
View directory record Official record
Conditions
Cigarette Smoker, Current Smoker, Former Smoker, Multiple Pulmonary Nodules, Pulmonary Nodule
Interventions
Computed Tomography, Fludeoxyglucose F-18, Fluorine F 18 L-glutamate Derivative BAY94-9392, Positron Emission Tomography (PET/CT)
Diagnostic Test · Drug
Lead sponsor
Andrei Iagaru
Other
Eligibility
45 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Apr 8, 2025 · Synced Sep 2, 2026, 1:01 PM EDT
Completed No phase listed Observational

Quantitation of Human Cerebral Nicotinie Receptors With 2[18F]FA-85380 and PET Healthy Non-smokers and Ex-Smokers and in Heavy and Light Situational Smokers

NCT01038245
View directory record Official record
Conditions
Nicotine Addiction
Interventions
Not listed
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years to 50 Years
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2011
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 2, 2026, 1:01 PM EDT
Completed No phase listed Observational

Couples Dynamics and Smoking Cessation

NCT03885336
View directory record Official record
Conditions
Smoking, Smoking Cessation, Cessation, Smoking, Smoking Behaviors, Smoking, Cigarette
Interventions
No Interventions
Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years to 65 Years
Enrollment
212 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 19, 2023 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Not applicable Interventional Results available

Efficacy of a Smoke-Free Homes Intervention

NCT04547686
View directory record Official record
Conditions
Cessation, Smoking
Interventions
Smoke-Free Homes Intervention, Quitline
Behavioral
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
916 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Sep 2, 2026, 1:01 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

A Smoking Cessation Study to Understand the Biological and Functional Changes After One Year of Smoking Cessation

NCT02432729
View directory record Official record
Conditions
Cigarette Smoking
Interventions
Not listed
Lead sponsor
Philip Morris Products S.A.
Industry
Eligibility
30 Years to 65 Years
Enrollment
1,184 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Charlotte, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 29, 2023 · Synced Sep 2, 2026, 1:01 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Evaluation of Lungs of Normal Individuals by Lung Lavage, Brushing and Bronchial Wall Biopsy

NCT00224185
View directory record Official record
Conditions
Smoking, Lung Diseases
Interventions
Bronchopulmonary Lung Lavage, Bronchial Brushing, Bronchial Wall Biopsy
Procedure
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older
Enrollment
196 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 1, 2016 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 2 Interventional Results available

A Trial of Placebo Versus Enzastaurin for Lung Cancer Prevention in Former Smokers

NCT00414960
View directory record Official record
Conditions
Lung Cancer
Interventions
Enzastaurin, Placebo
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
45 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated Sep 20, 2020 · Synced Sep 2, 2026, 1:01 PM EDT
Active, not recruiting Early Phase 1 Interventional Accepts healthy volunteers

Smoking Cessation Intervention During Low Dose CT (LDCT) Screening for Lung Cancer

NCT03059940
View directory record Official record
Conditions
Smoking Cessation
Interventions
Questionnaires, Low Dose Computed Tomography Scan, Shared Decision Making + Video, Cessation Counseling, Quitline, Pharmacotherapy Discussion, Nicotine Patch, Anti-Smoking Drug, Tobacco Treatment Program, Carbon Monoxide (CO) Level Test
Behavioral · Procedure · Other + 1 more
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
50 Years and older
Enrollment
630 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2026
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Offering Proactive Tobacco Treatment

NCT01123967
View directory record Official record
Conditions
Tobacco Use Cessation
Interventions
proactive outreach (PRO), telephone counseling (TC), Nicotine replacement therapy (NRT), Usual care (UC)
Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 64 Years
Enrollment
2,500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 3 Interventional Results available

RETHINC: REdefining THerapy In Early COPD for the Pulmonary Trials Cooperative

NCT02867761
View directory record Official record
Conditions
COPD (Chronic Obstructive Pulmonary Disease)
Interventions
Indacaterol/Glycopyrrolate, Placebo
Drug
Lead sponsor
University of Michigan
Other
Eligibility
40 Years to 80 Years
Enrollment
780 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
16
States / cities
Birmingham, Alabama • Los Angeles, California • San Francisco, California + 12 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2023 · Synced Sep 2, 2026, 1:01 PM EDT
Completed No phase listed Observational

Airway Epithelium Gene Expression: AEGIS IDE

NCT00746759
View directory record Official record
Conditions
Lung Cancer
Interventions
Biomarker (not used as an intervention)
Device
Lead sponsor
Allegro Diagnostics, Corp.
Industry
Eligibility
21 Years and older
Enrollment
1,331 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
21
States / cities
Birmingham, Alabama • Phoenix, Arizona • Sacramento, California + 17 more
Source: ClinicalTrials.gov public record
Updated Jun 3, 2015 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Celecoxib as a Chemopreventive Agent in Current and Former Smokers

NCT00981201
View directory record Official record
Conditions
Smoking, Prevention
Interventions
Celecoxib, Placebo
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years to 74 Years
Enrollment
219 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2001 – 2009
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 31, 2012 · Synced Sep 2, 2026, 1:01 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 29, 2024 · Synced Sep 2, 2026, 1:01 PM EDT
Recruiting Phase 2 Interventional

Immunoprevention for High-risk Lung Lesions

NCT07284485
View directory record Official record
Conditions
High-risk Lung Nodules
Interventions
Nadunolimab
Biological
Lead sponsor
Robert Samstein
Other
Eligibility
18 Years and older
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 7, 2026 · Synced Sep 2, 2026, 1:01 PM EDT
Completed Phase 3 Interventional Results available

Study Comparing Veliparib Plus Carboplatin and Paclitaxel Versus Investigator's Choice of Standard Chemotherapy in Adults Receiving First Cytotoxic Chemotherapy for Metastatic or Advanced Non-Squamous Non-Small Cell Lung Cancer (NSCLC) and Who Are Current or Former Smokers

NCT02264990
View directory record Official record
Conditions
Non-squamous Non-small Cell Lung Cancer
Interventions
Paclitaxel, Carboplatin, Cisplatin, Veliparib, Pemetrexed
Drug
Lead sponsor
AbbVie
Industry
Eligibility
18 Years and older
Enrollment
595 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
25
States / cities
Huntsville, Alabama • Mobile, Alabama • Springdale, Arkansas + 21 more
Source: ClinicalTrials.gov public record
Updated Feb 25, 2021 · Synced Sep 2, 2026, 1:01 PM EDT