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Between 2013 and 2017, by how much did the portion of adults in the U.S. who say they currently smoke marijuana increase?

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In 2013, 7% of adults in the U.S. said they currently smoked marijuana. By 2017, this figure had grown to 12%, which is a 71% increase. Other evidence, such as drug test failure rates, indicates that usage of marijuana and other psychoactive drugs has grown significantly in recent years. The average potency of marijuana has risen by about 2-7 times since the 1970s. THC is the psychoactive ingredient in marijuana, and higher levels of it may increase rates of addiction and mental health problems.

DocumentationMarijuana UsageDrug Test Failure RatesMarijuana Potency

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