The Effect of Medical Marijuana Laws on Marijuana, Alcohol, and Hard Drug Use
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21 states and the District of Columbia currently have laws that permit marijuana use for medical purposes, often termed medical marijuana laws (MMLs). We tested the effects of MMLs adopted in seven states between 2004 and 2011 on adolescent and adult marijuana, alcohol, and hard drug use. We
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美国国家经济研究局创建时间：
2014-05-01
