Study Finds Steep Surge in Americans’ Marijuana Habits

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Photo by Mike Mozart via Flickr

As several states prepare to vote on marijuana legalization, the British medical journal Lancet Psychiatry reports that about 10 million more Americans used marijuana in 2014 than in 2002. And those who said they smoked marijuana daily more than doubled, from 3.9 million to 8.4 million people.
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