Disorders associated with marijuana use, including addiction, car accidents and emergency room visits, went up, from 1.5% to 2.9%. Young users were a particular concern of researchers. “When examined by age, young adults were at highest risk for marijuana use disorder in both surveys” said the study. "Clearly, concerns about this age group continue, with prevention and intervention...critically needed.” Nearly three of 10 marijuana users manifested a marijuana use disorder in 2012-2013.
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