Despite Looser Marijuana Laws, No Spike in Teen Use

National data from 2013 show that 70 percent of 10th graders and 81 percent of 12th graders say it would be fairly easy or very easy to obtain marijuana.

SPH study: more time needed to see if rates rise

Since 1996, when California became the first US state to legalize marijuana for medical use, concerns about a possible spike in the number of adolescents using the drug have arisen. Today, 23 states and the District of Columbia have laws legalizing marijuana in some form—five of them, Alaska, Colorado, Washington, Oregon, and DC, effectively permit recreational use by adults 21 and older.

Despite those initial concerns, the less restrictive landscape has not led to an increase in marijuana use by adolescents, according to a new study coauthored by BU School of Public Health researchers.

The study, published online in the journal Drug and Alcohol Dependence, found that marijuana use among American...

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