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Recreational or ‘non-medical cannabis’ has been legalized in several US states, and was legalized federally in Canada in October 2018. There is little comparative data on product use across jurisdictions, particularly with respect to the types of cannabis products used, which differentially impact health.

Data are from Wave 1 of the International Cannabis Policy Study, collected from Aug 27–Oct 7, 2018. Respondents (n = 27,024) aged 16–65 completed an online survey measuring patterns of cannabis use, quantities and routes of administration. Respondents were recruited from Canada (n = 9976) and US states that had (n = 7362) and had not (n = 9686) legalized non-medical cannabis (‘legal’ and ‘illegal’ states, respectively).

Prevalence of at least daily, weekly, and monthly cannabis use were significantly higher in US ‘legal’ states (11.3%, 18.2%, 25.0%, respectively) than US ‘illegal …