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A June 2014 article in the New England Journal of Medicine (NEJM), written by researchers from the National Institute on Drug Abuse and the National Institutes of Health, points out that marijuana is not the harmless drug that many imagine.
Rather, it is associated with “substantial adverse effects, some of which have been determined with a high level of confidence.”
Negative outcomes
These negative outcomes include the risk of addiction, symptoms of chronic bronchitis, an elevated incidence of fatal and non-fatal motor vehicle accidents, and diminished lifetime achievement and school performance in cases of long-term use, especially beginning in adolescence.