The latest trend at teen parties isn't warm beer or prescription medicines pilfered from parents' medicine cabinets. Instead, increasing numbers of youths are turning to an herb-based product to get high, and unlike marijuana, it's perfectly legal.

It's known as K2 or Spice, a synthetic substance that, when smoked, gives users a marijuana-like high, according to drug authorities. Its growing popularity is causing increasing alarm among health care professionals, law enforcement authorities and lawmakers, with one Drug Enforcement Agency official calling its use the equivalent of "playing Russian roulette."

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4:20 statt Spice