Comparing Cannabis with Placebos for cannabis

Inclusion

• +19-25 or 35-45 years of age;
• +Holds a class G or G2 Ontario driver's licence (or equivalent from another jurisdiction) for at least 12 months;
• +Willing to abstain from using alcohol for 24 hours and cannabis for 72 hours prior to Practice and Test Sessions;
• +Willing to abstain from all other drugs not prescribed for medical purposes for 48 hours prior to Practice and Test Sessions;
• +Resides within Toronto (study siteTrial siteA hospital or clinic where a study is actually run.Read more →) or can reside with friends/family in Toronto after a Test Session; this area may be extended to the Greater Toronto area if recruitment challenges arise;
• +Provides written and informed consentInformed consentThe process of being told what taking part involves, then choosing freely.Read more →.
• +Exclusion CriteriaExclusion criteriaThe things that would prevent someone from taking part.Read more →
• +Use of cannabis primarily for therapeutic purposes, or equally for therapeutic and recreational purposes;
• +Diagnosis of psychiatric condition that contraindicates use of cannabis determined by self-report or SCID-5;
• +Is a regular user of medications that affect brain function (based on self-report); this includes concomitant therapy with sedative-hypnotics or other psychoactive drugs
• +Use of anti-hypertensives;
• +First-degree relative diagnosed with schizophrenia or another psychotic disorder.
• +Participation in a past driving study at CAMH (to limit practice effects).
• +Participation in a clinical study concurrent with their participation in this study.
• +Participant willing to use appropriate contraception until their participation in the study is completed;
• +Participants of childbearing potential: Pregnancy (point-of-care test) or breastfeeding;
• +Use of smoked cannabis at least once in the past 6 months.
• +Use of smoked or vaped cannabis primarily for recreational purposes on up to 1 day per week or on at least 6 days per week in the past 3 months;
• +Diagnosis of medical condition that contraindicates use of cannabis determined by self-report as judged by the Principal InvestigatorPrincipal investigatorThe doctor or researcher responsible for running the study at a site.Read more → and a study physician; this includes a history of hypersensitivity to cannabinoids smoke, respiratory disease and/or severe cardiovascular, cerebrovascular, renal or liver disease, and bleeding disorders. Smoking cannabis is not recommended for individuals with respiratory diseases, and they will be excluded;
• +Meets criteria for current or lifetime alcohol or other substance use disorder (DSM-5), except tobacco use disorder and caffeine use disorder;