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Cannabis use is the most widely used illicit substance in the USA. Currently, over half of US jurisdictions have legalised medical cannabis and nine US jurisdictions (and Washington DC) have legalised non‐medical cannabis. Comparisons across jurisdictions can help to evaluate the impact of these policies. The current study examined patterns of cannabis use among youth in three categories: (i) states that have legalised non‐medical cannabis with established markets; (ii) jurisdictions that recently legalised non‐medical cannabis without established markets; and (iii) all other jurisdictions where non‐medical cannabis is prohibited.

Data come from an online survey conducted among 4097 US youth aged 16–19 recruited through a commercial panel in July/August 2017. Regression models were fitted to examine differences between regulatory categories for cannabis …