Weill Cornell Medicine, 425 E 61st Street, Suite 301, New York, NY 10065, United States.
University of North Carolina Wilmington, 601 S. College Road, Wilmington, NC 28043-5920, United States.
J Health Econ. 2021 Dec;80:102537. doi: 10.1016/j.jhealeco.2021.102537. Epub 2021 Sep 25.
We studied the effect of marijuana liberalization policies on perinatal health with a multiperiod difference-in-differences estimator that exploited variation in effective dates of medical marijuana laws (MML) and recreational marijuana laws (RML). We found that the proportion of maternal hospitalizations with marijuana use disorder increased by 23% (0.3 percentage points) in the first three years after RML implementation, with larger effects in states authorizing commercial sales of marijuana. This growth was accompanied by a 7% (0.4 percentage points) decline in tobacco use disorder hospitalizations, yielding a net zero effect over all substance use disorder hospitalizations. RMLs were not associated with statistically significant changes in newborn health. MMLs had no statistically significant effect on maternal substance use disorder hospitalizations nor on newborn health and fairly small effects could be ruled out. In absolute numbers, our findings implied modest or no adverse effects of marijuana liberalization policies on the array of perinatal outcomes considered.
我们采用多期双重差分估计法研究了大麻合法化政策对围产期健康的影响,该方法利用了医用大麻法(MML)和娱乐用大麻法(RML)生效日期的差异。我们发现,RML 实施后的头三年,孕产妇因大麻使用障碍住院的比例增加了 23%(0.3 个百分点),在授权大麻商业销售的州,这一比例的增幅更大。这一增长伴随着烟草使用障碍住院率下降了 7%(0.4 个百分点),因此所有物质使用障碍住院率的净效应为零。RML 与新生儿健康的统计显著变化无关。MML 对孕产妇物质使用障碍住院率或新生儿健康没有统计学显著影响,并且可以排除相当小的影响。从绝对数字来看,我们的研究结果表明,大麻合法化政策对所考虑的一系列围产期结果没有产生适度或不利的影响。