Increase in marijuana use moderate

Washington University School of Medicine:

Marijuana use is on the rise, with an estimated 12.5 percent of adults living in the United States reportedly using the drug at least once in 2013, according to a new study that looked at drug usage over the span of a decade.

But that research, from Washington University School of Medicine in St. Louis, also shows that the rate of pot use did not double from 2002 to 2013 — as had been reported in the fall — and that the rate of problems related to the drug remained steady.

The Washington University researchers found that rather than doubling, the increase in marijuana use among adults was closer to 20 percent over the same time period and that problems related to using pot, such as addiction, remained steady or even declined.