To the Editor The Research Letter by Anderson et al¹ has been widely reported in the media as indicating that legalization of cannabis for recreational use actually reduces teen marijuana use. This counterintuitive and startling finding deserves close scrutiny. As the authors themselves state in the introduction, “repeated marijuana use during adolescence may lead to long-lasting changes in brain function that adversely affect educational, professional, and social outcomes.”^1,2 Therefore, it behooves us as phsyicians and scientists (and editors) to carefully assess any evidence that may lead (advertently or inadvertently) to increased cannabis use in young people. The authors state that they examined data from the Youth Risk Behavior Surveys 1993 to 2017. They state that they examined data from 7 states that contributed data to the YRBS before and after legalization of marijuana for recreational use. However, they do not list these states in the article, and it is not clear where they got this number. Two states listed in YRBS (Colorado and Alaska) legalized marijuana for recreational use in 2012 and 2014. However, another 4 states only legalized in 2016 and had not begun commercial sales as of January 1, 2017, which would not have allowed sufficient time to see a meaningful effect. The authors do not report the overall trends for teen marijuana use in the period in question.

致编辑安德森（Anderson）等人¹的研究信已在媒体上广泛报道，表明大麻合法化用于娱乐用途实际上减少了青少年大麻的使用。这一与直觉相反的惊人发现值得仔细审查。正如作者自己在导言中指出的那样：“青春期反复使用大麻可能会导致大脑功能的长期变化，从而对教育，职业和社会成果产生不利影响。” ^{1 ，2}因此，我们作为哲学家和科学家（及编辑）应该认真评估任何可能（无意间或无意间）导致年轻人使用大麻的证据。作者指出，他们检查了1993年至2017年“青少年风险行为调查”中的数据。他们指出，他们检查了来自七个州的数据，这些州在娱乐性大麻合法化之前和之后为YRBS贡献了数据。但是，他们没有在文章中列出这些状态，并且不清楚在何处获得此数字。YRBS中列出的两个州（科罗拉多州和阿拉斯加）于2012年和2014年将大麻合法化用于娱乐用途。但是，另外四个州仅在2016年合法化，并且自2017年1月1日起尚未开始商业销售，因此没有足够的时间进行销售。看到有意义的效果。