Longitudinal Outpatient Treatment for Cannabis Use Disorder

Inclusion Criteria: * Regular use (at least 4 times per week) of cannabis concentrates for at least the last year. * Meets DSM5 criteria for at least moderate CUD. * Currently seeking to cut down or stop cannabis use. Exclusion Criteria: * Use of any substance of abuse besides alcohol, nicotine, or cannabis (e.g., cocaine, non-prescription use of opiates, methamphetamine, MDMA, benzodiazepines, or barbiturates) in the past 90 days, as indicated by self-report and urine toxicology screening (Syva Rapid Test) at baseline. * Use of CBD-dominant products in the past 90 days, as evidenced by self-report of use of a CBD\>THC product or CBD blood levels at baseline of \>= 5 ng/mL * Alcohol use on 3 or more days per week, and/or \> 3 drinks per drinking day in the past 90 days. Participants must also have a breath alcohol level of 0 at the beginning of each study visit. * Daily nicotine use. * Meets DSM-5 diagnostic criteria for a psychotic disorder (e.g., schizophrenia, schizophreniform disorder, schizoaffective disorder), bipolar disorder, or major depression with suicidal ideation, or has a history of treatment for these disorders. Psychiatric disorders will be assessed with the Mini-International Neuropsychiatric Interview (MINI). * Current cardiovascular or respiratory disease (e.g., coronary artery disease, severe asthma, chronic obstructive pulmonary disease, etc.) * Current use of psychotropics (e.g., antidepressants, anxiogenics), which may dampen effects of CBD. * Curren…