Brief CommunicationAdolescent Marijuana Use from 2002 to 2008: Higher in States with Medical Marijuana Laws, Cause Still Unclear
Introduction
Between 1996 and 2011, 16 states passed laws legalizing use of marijuana for medical purposes when medically authorized (1). Due to the potential for serious short- and long-term consequences of marijuana use in adolescence 2, 3, 4, 5, 6, 7, prevention of adolescent marijuana initiation is a key NIDA strategy (8). Although the potential impact of MML has been much discussed in the popular press, formal scientific assessments of the relation between MML and adolescent marijuana use using national data are lacking. Using 2002–2008 data from the National Survey on Drug Use and Health (NSDUH), we compared the prevalence of marijuana use and perceptions of its riskiness among 12–17 year olds in states that have passed medical marijuana laws (MML) to states without such laws.
Section snippets
Methods
The NSDUH is administered to approximately 70,000 individuals annually and oversamples adolescents so that approximately one-third (n = 23,300) of the sample includes 12 to 17 year olds. Publicly available state-level estimates for NSDUH respondents aged 12–17 were compiled from 2002–2008 with 2008 being the most current results presently available (9). The NSDUH survey was initiated in 1999, but due to improvements in data collection procedures in 2002, prevalence rates before 2002 are not
Results
The overall prevalence of past-month marijuana use among 12–17 year olds averaged across all states and years was 7.50%. Figure 1 shows the prevalence by year for each state. The 16 states which passed MML (thick lines; solid after passage and dashed before passage) by 2011 had higher average use, 8.68% (95% CI: 7.95–9.42%), during the period 2002–2008 compared to the 34 states without MML, 6.94% (95% CI: 6.60–7.28%). Two states without MML but with high average use were New Hampshire (9.50%)
Discussion
Between 2002 and 2008, adolescent marijuana use was higher and perception of its riskiness lower in states with medical marijuana laws compared to states without such laws. There are several possible explanations for this observation. First, it is possible that states with higher marijuana use and lower perceptions of risk are more likely to enact MML. This explanation is supported in the current analysis by the observation that among states that eventually enacted MML, use was higher and
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