Marijuana potency increased last year to the highest level in more than 30 years. The analysis from the University of Mississippi's Potency Monitoring Project tracked the average amount of THC, the psychoactive ingredient in marijuana, in samples seized by law enforcement agencies from 1975 through 2007. It found that the average amount of THC reached 9.6% in 2007, compared with 8.75% the previous year. The 9.6% level represents more than a doubling of marijuana potency since 1983, when it averaged just under 4%.
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