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U.S. emergency room visits due to synthetic marijuana (above), also known as "spice" or "K2," doubled from 2010 to 2011 — and quadrupled for 18- to 20-year-olds. (AP Photo/Minnesota Dept. of Human Services)
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U.S. emergency room visits due to synthetic marijuana (above), also known as "spice" or "K2," doubled from 2010 to 2011 — and quadrupled for 18- to 20-year-olds. (AP Photo/Minnesota Dept. of Human Services)

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