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11% of teens who try marijuana report they are dependent a year later, national study says
Updated 9:16 AM;
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Nearly 11 percent of teenagers who had tried marijuana reported being dependent on it a year later, according to a national study that comes as New Jersey, New York and a growing number of states move to legalize and develop a legitimate cannabis industry for adults 21 and older.
By year three, 20% had developed a substance abuse disorder, according to the research paper published on March 29 in JAMA Pediatrics.
The authors, researchers at the National Institute on Drug Abuse, urged doctors to start screening teenagers for marijuana use. ....

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