Economic recession along with the growing acceptance of marijuana may be driving up the rates of illegal drug use in the U.S., according to a report by the Substance Abuse and Mental Health Services Administration. Illicit drug use among Americans 12 years and older reached 8.7% in 2009 -- the highest in nearly 10 years. Meanwhile, the use of prescription drugs for nonmedical purposes climbed from 2.5% in 2008 to 2.8% last year.

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