Perhaps as early as next week, Michigan Gov. Jennifer Granholm is expected to sign a series of bills that would outlaw K2 -- one of several names given to synthetic cannabinoids ("fake marijuana") that are sprayed onto different herbs and sold legally in smoke shops across the country.

Such products are labeled "not for human consumption," but people use them anyway, because, when smoked, they can mimic the effects of marijuana, but they don't show up on drug tests. More importantly, unlike marijuana, K2 is legal to buy -- though perhaps not for long. In just six months, 13 different states have moved to ban the substance, fueled primarily by reports of K2's adverse health effects. With Granholm's signature, Michigan would become the 14th.

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Toxicologists at three universities and two governmental agencies have launched a study into the effects of a synthetic drug being used by some smokers as a legal substitute to marijuana. Credit: AP Photo/Kelley McCall

Teens are getting high on an emerging drug called "fake weed," a concoction also known as K2 and "spice" that is also causing hallucinations, vomiting, agitation and other dangerous effects.

In the last month, Dr. Anthony Scalzo, a professor of toxicology at Saint Louis University, has seen nearly 30 cases of teenagers experiencing these adverse effects after smoking the fake weed, a legal substance that reportedly offers a marijuana-like high.

"K2 use is not limited to the Midwest; reports of its use are cropping up all over the country," Scalzo said. "I think K2 is likely a bigger problem than we're aware of at this time." For instance, Atlanta has seen about 12 cases recently.

K2 has been sold since 2006 as incense or potpourri for about $30 to $40 per three gram bag – comparable in cost to marijuana.

"K2 may be a mixture of herbal and spice plant products, but it is sprayed with a potent psychotropic drug and likely contaminated with an unknown toxic substance that is causing many adverse effects," said Scalzo, who also directs the Missouri Regional Poison Control Center.

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