Associations between recreational cannabis legalization and cannabis-related emergency department visits by age, gender, and geographic status in Ontario, Canada: An interrupted time series study.

In Southern Ontario ( Table 3 ), there was an increasing trend in cannabis-related ED visits across all gender and age groups during the pre-legalization period: at the lowest end, an increase of 1.6% ED visits per month among women aged 18–24 (IRR = 1.016, 95% CI 1.013–1.020), and at the highest end, an increase of 7.3% ED visits per month among boys aged 0–17 (IRR = 1.073, 95% CI 1.064–1.082).

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