CHICAGO (AP) -- Marijuana use among U.S. adults doubled over a decade, rising to almost 10 percent 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, noting that other studies have shown increasing numbers of adults think marijuana should be legalized. Recreational use is now permitted in four states.
Almost 1 in 3 users had signs of marijuana dependence or abuse, a slight decline from a decade ago.
The results come from a comparison of health surveys from 2001-02 and 2012-13 sponsored by the National Institute on Alcohol Abuse and Alcoholism. Almost 80,000 adults aged 18 and older participated in face-to-face interviews about various health-related behaviors. Results were published Wednesday in the journal JAMA Psychiatry
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