[quote]Cannabis use in the United States has increased, with more people visiting hospital emergency departments over its use, a UN report says. The potency of the drug in the US appeared to have increased, making it more harmful, the UN Office on Drugs and Crime's World Drugs Report added. It said it was too early to tell if the legalisation of cannabis in two US states had had an impact on drug use. Global illegal opium poppy farming rose 26% between 2012 and 2013, it added. "In the United States, the lower perceived risk of cannabis use has led to an increase in its use," the report said, although global use of cannabis appeared to have fallen. There was a 56% increase in US cannabis-related emergency department visits between 2006 and 2010, and a 14% increase in admission to treatment centres for drug abuse over the same period, the report said, citing US government data. The percentage of people in the US aged 12 or older who admitted to using marijuana in the past year had increased from 10% in 2008 to 12% in 2012, the report added.[/quote]