Pot use doubled as laws slackened – even before all out legalization

The number of US adults using marijuana doubled between 2001 and 2013, as have the number of adults who are victim to marijuana dependence and abuse, according to a study published Wednesday in the JAMA Psychiatry, an American Medical Association publication. 

Ten percent of adults reported using marijuana between 2012 and 2013, which is a big jump from the reported 4 percent of adult users between 2001 and 2002. Only 1.5 percent of marijuana users had dependence-related issues in 2001, but during 2013 interviews, the researchers found that now three out of every 10 marijuana users (about 7 million Americans) abuse the drug.

But the researchers note that these use-and-abuse statistics are largely due to the overall increase in new users rather than indication that existing users are moving from recreational to dependent smokers. In fact, existing marijuana users showed a 15...

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