Teen marijuana use declines even as states legalize

December 16, 2014 7:41 PM

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Marijuana use among teens declined this year even as two states, Colorado and Washington, legalized the drug for recreational use, a national survey released Tuesday found.

University of Michigan's Monitoring the Future study, now in its 40th year, surveys 40,000 to 50,000 students in 8th, 10th and 12th grade in schools nationwide about their use of alcohol, legal and illegal drugs and cigarettes.

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