Post-approval studies (Phase 4)Study completedNCT04228965What this trial is testingCannabis and Tobacco Co-use StudyWho this might be right forTobacco Use Disorder Medical University of South Carolina 181
Not applicableTemporarily pausedNCT05121428What this trial is testingPatients' Attitudes Toward and Experiences With Buprenorphine TreatmentWho this might be right forOpioid-use DisorderAcceptability of Health CareOpioid-Related Disorders Cambridge Health Alliance 817
Testing effectiveness (Phase 2)Study completedNCT00743366What this trial is testingEffect of Quetiapine on Marijuana Withdrawal and RelapseWho this might be right forMarijuana Smoking New York State Psychiatric Institute 20
Not applicableLooking for participantsNCT07439471What this trial is testingUnderstanding Tobacco and Cannabis Co-Use Practices: Initiation, Escalation, and MaintenanceWho this might be right forCigarette Smoking-Related Carcinoma Roswell Park Cancer Institute 40
Not applicableStudy completedNCT01096303What this trial is testingEffects of Marijuana Used on Lung Function in Persons With Chronic Obstructive Pulmonary Disease (COPD)Who this might be right forChronic Obstructive Pulmonary Disease The University of Texas Health Science Center, Houston 200
Not applicableLooking for participantsNCT06239350What this trial is testingYoung Adult Tobacco/Nicotine and Cannabis Co-useWho this might be right forTobacco Use DisorderNicotine Dependence Medical University of South Carolina 350
Early research (Phase 1)Not Yet RecruitingNCT06055231What this trial is testingPK/PD of Vaping THC-containing Liquids vs. Smoked CannabisWho this might be right forCigarette Smoking-Related Carcinoma Roswell Park Cancer Institute 40
Testing effectiveness (Phase 2)Study completedNCT01292642What this trial is testingCognitive Behavioral Therapy and the Nicotine Transdermal Patch for Cannabis Dependence and Nicotine DependenceWho this might be right forCannabis DependenceNicotine Dependence Mclean Hospital 12
Not applicableStudy completedNCT02869451What this trial is testingMobile Contingency Management for Marijuana and Tobacco CessationWho this might be right forCigarette SmokingMarijuana Abuse Duke University 7
Not applicableLooking for participantsNCT07167225What this trial is testingCarcinogen and Toxicant Exposure Among Young Adults Who Co-Use E-cigarettes and Cannabis (Co-Tox Study)Who this might be right forCigarette Smoking-Related CarcinomaE-Cig Use Roswell Park Cancer Institute 150
Not applicableActive Not RecruitingNCT06120855What this trial is testingStudy on Regulated Cannabis Sales in PharmaciesWho this might be right forMarijuana SmokingCannabisCannabis Use University of Bern 1,091
Not applicableStudy completedNCT03107936What this trial is testingDevelopment of a Videogame Prototype Targeting Cigarette and Marijuana Smoking, and Tobacco Product Prevention Among Young AdolescentsWho this might be right forSmoking Yale University 40
Early research (Phase 1)Looking for participantsNCT06609109What this trial is testingEffect of Cannabis on E-Cigarette Use BehaviorWho this might be right forCannabis UseTobacco UseElectronic Cigarette Use Johns Hopkins University 100
Testing effectiveness (Phase 2)Study completedNCT01081119What this trial is testingBrief Voluntary Alcohol and Drug Intervention for Middle School YouthWho this might be right forAlcohol DrinkingCigarette SmokingMarijuana Smoking RAND 6,455
Very early researchStudy completedNCT02817698What this trial is testingImaging the Neurochemistry of Drug Addiction With PETWho this might be right forSmokingCannabis Yale University 25
Testing effectiveness (Phase 2)Study completedNCT01394185What this trial is testingEffects of Dronabinol (Oral THC) on Cannabis UseWho this might be right forMarijuana Smoking Johns Hopkins University 25
Not applicableStudy completedNCT05620433What this trial is testingJoint Effort 2.0: a Mobile Application With University StudentsWho this might be right forCannabis UseCannabisCannabis Dependence+2 more Centre hospitalier de l'Université de Montréal (CHUM) 354
Testing effectiveness (Phase 2)Study completedNCT03518567What this trial is testingBehavioral Economic Analysis of Demand for MarijuanaWho this might be right forMarijuana Smoking Brown University 133
Early research (Phase 1)Study completedNCT02961309What this trial is testingA Laboratory Model of Increasing Delta-9-tetrahydrocannabinol (THC) Potency on Cigarette SmokingWho this might be right forTobacco Use Battelle Memorial Institute 9
Not applicableEnded earlyNCT04572646What this trial is testingBenefit of Systematic Proposition of Nicotine Substitution for Patients Undergoing SurgeryWho this might be right forSmoking Cessation Groupe Hospitalier Mutualiste de Grenoble 20