Marijuana Use Doubles in U.S., But So Do Problems

October 21, 2015 5:40 PM

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Marijuana use has more than doubled in the U.S. since the beginning of the century — but so have problems for users, including addiction, researchers reported Wednesday.

They found 9.5 percent of U.S. adults used marijuana in 2013, up from 4.1 percent in 2001-2002.

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