Supplementary Material for: Exploring associations between cannabis prices, stores, and usage after recreational legalization

Introduction: Canada legalized recreational cannabis in October 2018, but commercial retailing took time to develop. This study first explored how self-reported cannabis use prevalence, daily use, product type use, and age of initial use changed during 2019-2023. It then analyzed whether the changes were associated with rising store numbers or falling prices. Methods: Data on store counts, retail pricing, and cannabis use came from government reports covering 10 provinces over 5 years. Panel data linear regressions analyzed 50 province-year aggregated observations. Results: There were no significant changes in prevalence among males and people aged 16-24, or in the proportion using cannabis daily. Prevalence among females increased; it was negatively associated with prices. Prevalence among people aged 25+ also increased: it showed tentative negative associations with prices. Dried cannabis use decreased and was positively associated with prices. Edibles use increased and was negatively associated with prices. Mean initial age of use increased; it was negatively associated with prices and positively with stores. Conclusion: Canada’s large cannabis retail expansion was accompanied by relatively modest usage changes, most of which showed associations with falling prices but not rising store counts.研究背景：加拿大于2018年10月将娱乐用大麻合法化，但商业零售体系的成熟耗时良久。本研究首先考察了2019年至2023年间，自我报告的大麻使用流行率、每日使用比例、不同产品类型的使用情况以及初次使用年龄的变化趋势；随后分析了上述变化是否与大麻零售门店数量增长或产品价格下跌存在关联。 研究方法：本研究使用的门店数量、零售定价及大麻使用相关数据均来自覆盖加拿大10个省份、跨度5年的政府公开报告，通过面板数据（Panel Data）线性回归模型对50组省份-年度汇总观测值开展分析。 研究结果：男性群体与16-24岁人群的大麻使用流行率，以及大麻每日使用占比均未出现显著变化；女性群体的使用流行率有所上升，且与价格呈负相关关系。25岁及以上人群的使用流行率同样有所上升，其与价格呈现初步的负相关关联。干制大麻的使用量有所下降，且与价格呈正相关关系；大麻食品（Edibles）的使用量有所上升，且与价格呈负相关关系。平均初次使用年龄有所提升，其与价格呈负相关，而与零售门店数量呈正相关。 研究结论：加拿大大麻零售规模的大幅扩张，仅伴随了幅度相对有限的使用行为变化；其中绝大多数变化均与价格下跌存在关联，而非与门店数量增长相关。