More US Adults Using Marijuana

As attitudes about marijuana change in the United States, more adults are using the drug, according to a new study. Researchers at the National Institute on Drug Abuse, National Institutes of Health, writing in The Lancet Psychiatry, say that as more states legalize recreational and medical use of marijuana, fewer adults feel there are dangers associated with its use. Using data from nearly 600,000 adults over the age of 18, the researchers found that from 2002 to 2014 marijuana use...

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