Chart from a fact sheet by the Office of National Drug Control Policy at the White House.
In recent decades, marijuana growers have been genetically altering their plants to increase the percentage of delta-9-tetrahydrocannabinol (THC), the main active ingredient in marijuana. The average potency of tested marijuana from Federal seizures more than doubled from 1998 to 2010.Via The Dish, where one user's bad experience is noted and countered.
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