Medical Marijuana Laws Don't Increase Teen Use

Teen use of marijuana doesn't seem to change when states pass laws legalizing the drug for medical purposes, a new study suggests.

Researchers analyzed information from more than 1 million U.S. teens in grades 8, 10 and 12, who were asked whether they'd used marijuana in the past month. The researchers collected 24 years' worth of survey data, spanning 1991 to 2014.

Overall, teen marijuana use was more common in states that had passed medical marijuana laws as of 2014 — nearly 16 percent of teens in states where medical marijuana is legal said they had used marijuana in the past month, compared with 13 percent of teens in states where medical marijuana is not legal.

But when researchers looked at marijuana use over time in the 21 states where medical marijuana was legal by 2014, they found no change in marijuana use after a medical marijuana...

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http://www.livescience.com/51214-teen-marijuana-use-legalization.html