Effects of State Medical Marijuana Laws on Adolescent Marijuana Use
Effects of State Medical Marijuana Laws on Adolescent Marijuana Use
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DOI：
10.2105/ajph.2012.301117
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发表时间：
2013-08-01
影响因子：
12.7
通讯作者：
Wagenaar, Alexander C.
中科院分区：
文献类型：
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作者：
Lynne-Landsman, Sarah D.;Livingston, Melvin D.;Wagenaar, Alexander C.
目标。医用大麻法（MML）被认为是美国青少年吸食大麻增加的一个可能原因。我们评估了 2003 年至 2011 年 MML 对青少年吸食大麻的影响。方法。我们使用青少年风险行为调查的数据和双重差分设计来评估州 MML 的通过对青少年大麻使用的影响。接受调查的各州（蒙大拿州、罗德岛州、密歇根州和特拉华州）在 8 年的时间里的不同时间通过了 MML，确保同时代的历史不会成为设计混乱的结果。在 40 项计划中，对各州接触过和未接触过 MML 的青少年进行的长期比较中，只发现了 2 个显着影响，这是仅根据偶然性所预期的结果。对（不显着）估计值的进一步检查显示，没有明显的模式表明对自我报告的大麻使用流行率或频率有影响。结论。我们的结果表明，在此处评估的州中，MML 在颁布后的最初几年内并未对青少年大麻的使用产生显着影响。在更全面地实施 MML 后，长期结果可能会有所不同。
Objectives. Medical marijuana laws (MMLs) have been suggested as a possible cause of increases in marijuana use among adolescents in the United States. We evaluated the effects of MMLs on adolescent marijuana use from 2003 through 2011.Methods. We used data from the Youth Risk Behavior Survey and a difference-in-differences design to evaluate the effects of passage of state MMLs on adolescent marijuana use. The states examined (Montana, Rhode Island, Michigan, and Delaware) had passed MMLs at different times over a period of 8 years, ensuring that contemporaneous history was not a design confound.Results. In 40 planned comparisons of adolescents exposed and not exposed to MMLs across states and over time, only 2 significant effects were found, an outcome expected according to chance alone. Further examination of the (nonsignificant) estimates revealed no discernible pattern suggesting an effect on either self-reported prevalence or frequency of marijuana use.Conclusions. Our results suggest that, in the states assessed here, MMLs have not measurably affected adolescent marijuana use in the first few years after their enactment. Longer-term results, after MMLs are more fully implemented, might be different.