Marijuana Use, Disorders Doubled Since 2001

Pot consumption rises from 4 to 10 percent among adults as attitudes and laws have become more tolerant

NEW YORK (Reuters Health) - As attitudes and laws in the U.S. have become more tolerant of marijuana, the proportion of adults using and abusing the substance at least doubled between 2001 and 2013, according to a new study.

Although marijuana dependence and abuse was found to be on the rise, that is largely due to the overall increase in new users, researchers note, while existing marijuana users experienced a 15% decline in pot-related disorders.

About 4% of adults between 2001 and 2002 reported having used marijuana in the past year, compared to about 10% between 2012 and 2013. Similarly, 1.5% had abuse or dependence problems - marijuana use disorder - at the start of the 21st century, compared to about 3% from 2012 to 2013.

"What was quite clear is the...

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