Marijuana use jumps in US adults, to almost 10 per cent; almost 1 in 3 users may have a problem

In this Tuesday, Jan. 13, 2015, file photo, a flower nearly ready for harvest sits atop a mature marijuana plant at the Pioneer Production and Processing marijuana growing facility in Arlington, Wash. According to results published Wednesday, Oct. 21, 2015, in JAMA Psychiatry, marijuana use among U.S. adults doubled over a decade, rising to almost 10 percent or more than 22 million mostly recreational users, according to government surveys. The trend reflects a cultural shift and increasingly permissive views about the drug, researchers say, noting that other studies have shown increasing numbers of adults think marijuana should be legalized. Photograph by: Elaine Thompson, File , AP

CHICAGO - Marijuana use among U.S. adults doubled over a decade, rising to almost 10 per cent or more than 22 million mostly recreational users, government surveys show.

The trend reflects a cultural shift and increasingly permissive views about the drug, the researchers say,...

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