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Showing 1–24 of 47 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Carbon Monoxide Test Clear all
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Project Impact 2: A Culturally Tailored Smoking Cessation Intervention for Latino Smokers

NCT02596711
View directory record Official record
Conditions
Tobacco Use Cessation, Cancer Prevention
Interventions
Nicotine Patch, Questionnaires, Carbon Monoxide (CO) Test, Health Education and Handouts, Culturally Tailored Reading Materials, Counseling Sessions
Drug · Behavioral · Other
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 9, 2020 · Synced Sep 3, 2026, 5:58 AM EDT
Completed No phase listed Observational

COVID-19 Respiratory Outcomes Registry

NCT05074875
View directory record Official record
Conditions
Covid19
Interventions
Questionnaires and Patient Reported Outcomes (PROs), Nasal Swab COVID-19 reverse transcription polymerase chain reaction test (RT-PCR), Blood Samples for Biomarkers, High Resolution Computed Tomography, Physical Exam and Vital Signs, Medical Research Council Sum Score, Hand Grip Strength, Spirometry, Diffusing Capacity of Carbon Monoxide, 6 Minute Walk Test, Sit to Stand (STS) Measurement
Other · Diagnostic Test · Genetic
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older
Enrollment
37 participants
Timeline
2021 – 2023
U.S. locations
4
States / cities
St Louis, Missouri • New York, New York • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 26, 2023 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Results available

Postoperative Heme Oxygenase Induction and Carbon Monoxide Production as a Novel Method to Assess Hepatic Regeneration and Predict Hepatic Related Morbidity After Partial Hepatectomy

NCT04195438
View directory record Official record
Conditions
Liver Cancer
Interventions
CO Testing Pre/Post Hepatic Resection, ABG Testing Pre/Post Hepatic Resection, CT Evaluations
Procedure · Diagnostic Test
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2024
U.S. locations
1
States / cities
Glen Burnie, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 20, 2024 · Synced Sep 3, 2026, 5:58 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Bilirubin Binding Capacity to Assess Bilirubin Load in Preterm Infants

NCT02691156
View directory record Official record
Conditions
Bilirubin-induced Neurologic Dysfunction, Hyperbilirubinemia, Kernicterus, Infant, Premature, Infant, Low Birth Weight
Interventions
Bilirubin Binding Capacity, End-tidal Carbon Monoxide, Carboxyhemoglobin
Diagnostic Test
Lead sponsor
Stanford University
Other
Eligibility
24 Weeks to 34 Weeks
Enrollment
143 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 30, 2021 · Synced Sep 3, 2026, 5:58 AM EDT
Not listed No phase listed Observational

A Digital Smoking Cessation Intervention for Adults With Substance Use Disorder

NCT04419922
View directory record Official record
Conditions
Tobacco Use Disorder, Substance Use Disorders
Interventions
Smartphone Contingency Management Intervention
Behavioral
Lead sponsor
BrightView LLC
Industry
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 8, 2020 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Results available

QuitBet Phase II: A Digital Social Game That Pays You to Stop Smoking

NCT05075213
View directory record Official record
Conditions
Smoking Cessation
Interventions
contingency management (deposit contract), leaderboard and social feed, smoking cessation resource list
Behavioral
Lead sponsor
WayBetter, Inc.
Industry
Eligibility
21 Years and older
Enrollment
245 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Smoking Cessation for Veterans With Severe and Persistent Mental Illness

NCT00960375
View directory record Official record
Conditions
Schizoaffective Disorder, Schizophrenia, Affective Psychosis, Bipolar, Affective Disorders, Psychotic
Interventions
BTSCS, StSST
Behavioral
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 75 Years
Enrollment
179 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 17, 2015 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Results available

COach2Quit TRIAL: Assessing a Prototype Personal Carbon Monoxide Monitor for Smoking Cessation

NCT03142932
View directory record Official record
Conditions
Smoking, Smoking Cessation
Interventions
Individualized carbon monoxide (iCO) monitor, COach2Quit smartphone application, Cessation counseling
Device · Other · Behavioral
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 3, 2019 · Synced Sep 3, 2026, 5:58 AM 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 3, 2026, 5:58 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Harnessing the Power of Technology: MOMBA for Postpartum Smoking

NCT02237898
View directory record Official record
Conditions
Smoking Cessation
Interventions
MoMba Live Long app & Sensordrone™ carbon-monoxide sensor, Office contingency management, Sensordrone™ carbon-monoxide sensor, MoMba Live Long Smartphone application
Behavioral · Device
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated May 20, 2020 · Synced Sep 3, 2026, 5:58 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Effects of Tobacco Cut and Nicotine Form on the Abuse Liability of Moist Snuff

NCT06249984
View directory record Official record
Conditions
Tobacco-Related Carcinoma
Interventions
Biospecimen Collection, Carbon Monoxide Measurement, Smokeless Tobacco Use, Survey Administration
Procedure · Behavioral · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
21 Years and older
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
2
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 16, 2026 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional

Online Tai Chi Intervention to Promote Smoking Cessation Among Cancer Survivors

NCT05941858
View directory record Official record
Conditions
Cancer
Interventions
Smoking Cessation Intervention, Carbon Monoxide Measurement, Internet-Based Intervention, Survey Administration, Tai Chi
Behavioral · Procedure · Other
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
21 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Sep 3, 2026, 5:58 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Comparison of Smoking and Vaping in Families

NCT02500238
View directory record Official record
Conditions
Smoking
Interventions
Saliva sample, Urine Sample, Toe nail clippings, Breath carbon monoxide test
Other
Lead sponsor
University of Florida
Other
Eligibility
6 Years to 17 Years
Enrollment
44 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2016
U.S. locations
2
States / cities
Gainesville, Florida • Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated Dec 27, 2018 · Synced Sep 3, 2026, 5:58 AM EDT
Completed No phase listed Observational

Pulmonary Function in Patients With Hodgkin's Disease Receiving Bleomycin-Based Chemotherapy

NCT00165438
View directory record Official record
Conditions
Hodgkin's Disease
Interventions
Pulmonary Function Tests, CAT Scan
Procedure
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2010
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 19, 2012 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Evaluation of Canakinumab in High-Risk Former-Smokers

NCT06038526
View directory record Official record
Conditions
Cigarette Smoking-Related Carcinoma, Lung Carcinoma
Interventions
Biospecimen Collection, Bronchoscopy, Canakinumab, Carbon Monoxide Measurement, Survey Administration
Procedure · Biological · Other
Lead sponsor
Peter Shields
Other
Eligibility
40 Years to 73 Years
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Exhaled Carbon Monoxide (eCO) for Diffusing Capacity (DLCO) Correction

NCT01126047
View directory record Official record
Conditions
Lung Diseases
Interventions
eCO testing
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 8, 2011 · Synced Sep 3, 2026, 5:58 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Brain Integrity in Survivors of Hodgkin Lymphoma Treated With Thoracic Radiation

NCT01820117
View directory record Official record
Conditions
Hodgkin Lymphoma
Interventions
Neurocognitive Evaluation, Quantitative Brain Imaging, Neurologic Evaluation, Health Questionnaire, Vascular Testing, Cardiopulmonary Exercise Testing, Echocardiography, Pulmonary Function Testing, Serum Biomarkers, Ophthalmology Examination
Other · Procedure
Lead sponsor
St. Jude Children's Research Hospital
Other
Eligibility
18 Years and older
Enrollment
416 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2018
U.S. locations
1
States / cities
Memphis, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 28, 2018 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Prize Reinforcement for Smoking Cessation

NCT00865254
View directory record Official record
Conditions
Nicotine Dependence
Interventions
Standard Treatment, Traditional Contingency Management, Early Enhanced Contingency Management
Behavioral
Lead sponsor
Wayne State University
Other
Eligibility
13 Years and older
Enrollment
84 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2011
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Jun 27, 2013 · Synced Sep 3, 2026, 5:58 AM EDT
Withdrawn Not applicable Interventional

Contingency Management for Smoking Cessation in Pregnant Minority Women

NCT02195570
View directory record Official record
Conditions
Cigarette Smoking
Interventions
Quit Smoking Now (QSN), Prize-based Contingency Management (CM)
Other · Behavioral
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 8, 2019 · Synced Sep 3, 2026, 5:58 AM EDT
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 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Reducing Tobacco Exposures Among African American Women and Children

NCT03476837
View directory record Official record
Conditions
Tobacco Use, Second Hand Tobacco Smoke
Interventions
Treatment, Control
Behavioral
Lead sponsor
University of Arkansas
Other
Eligibility
18 Years to 50 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Oct 18, 2023 · Synced Sep 3, 2026, 5:58 AM EDT
Completed Not applicable Interventional Results available

Quit & Fit 2.0: Feasibility and Usability Testing

NCT05878990
View directory record Official record
Conditions
Smoking Cessation
Interventions
Culturally-tailored Tobacco Treatment, Culturally-tailored Content Newsletters, Control Preference Scale, Active Content Newsletter or Passive Content Newsletter
Behavioral
Lead sponsor
Hackensack Meridian Health
Other
Eligibility
18 Years to 69 Years · Female only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Nutley, New Jersey
Source: ClinicalTrials.gov public record
Updated Oct 16, 2024 · Synced Sep 3, 2026, 5:58 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Nicotine Withdrawal and Reward Processing: Connecting Neurobiology to Real-world Behavior

NCT03840694
View directory record Official record
Conditions
Cigarette Smoking, Nicotine Withdrawal
Interventions
Smoking Abstinence, Ad Lib Smoking
Other
Lead sponsor
Duke University
Other
Eligibility
21 Years to 55 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 19, 2021 · Synced Sep 3, 2026, 5:58 AM EDT