About one in 10 American adults has used marijuana in the last year.

That sounds pretty mellow. But researchers at the National Institute on Alcohol Abuse and Alcoholism say that’s more than double what it was more than a decade ago.

Bridget F. Grant and co-authors looked at the prevalence of cannabis use from 2001 to 2012 and concluded that 9.5 percent of us have toked up in the last year they examined.

That figure was 4.1 percent in 2001, according to a statement from the journal JAMA Psychiatry, which recently published the results.

The biggest increases in pot use came from women, African-Americans, Latinos, those living the south, and Americans who are middle-aged or older, JAMA said.

Researchers said marijuana dependence has increased from 1.5 percent in 2001 to 2.9 percent in 2013. Nearly three in 10 of us who used pot in the last year examined suffered from dependence, they said.

However, JAMA explained:

Among marijuana users, the prevalence of marijuana use disorder decreased to 30.6 percent in 2012-2013 from 35.6 percent in 2001-2002. Because there was no increase in the risk for marijuana use disorder found among users, in fact there was a decrease, the increase in prevalence of marijuana use disorders can be attributed to the increase in marijuana users between the two surveys, the authors note.

“Many individuals can use marijuana without becoming addicted,” the study says. “However, the clear risk for marijuana use disorders among users (approximately 30 percent) suggests that as the number of U.S. users grows, so will the numbers of those experiencing problems related to such use.”

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