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Published December 15, 2011, 12:01 PM

Study: Synthetic pot used by 1 in 9 U.S. 12th-graders

High school seniors in Midwest had 13.5% rate of use, highest in nation
The study, released Wednesday by the National Institutes of Health, is believed to be the first government attempt to survey the popularity of synthetic substances often marketed as "herbal incense" and sold under brands such as "Spice" and "K2." Senior students with the highest rate of use -- 13.5 percent -- were from the Midwest.

By: Pam Louwagie, Star Tribune (Minneapolis) / MCT

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