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Effects of State Medical Marijuana Laws on Adolescent Marijuana Use
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Effects of State Medical Marijuana Laws on Adolescent Marijuana Use
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Journal Article
Effects of State Medical Marijuana Laws on Adolescent Marijuana Use
2013
Overview
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.
Publisher
American Public Health Association
Subject
/ Biological and medical sciences
/ Clinics
/ Commerce - legislation & jurisprudence
/ Drugs
/ Female
/ Humans
/ Law
/ Male
/ Marijuana Abuse - epidemiology
/ Marijuana Smoking - epidemiology
/ Marijuana Smoking - legislation & jurisprudence
/ Patients
/ Phytotherapy - adverse effects
/ Public health. Hygiene-occupational medicine
/ Studies
