K2—sometimes called “genie” or “Zohai”—is a substance chemically similar to pot. Its key ingredient, JWH-018, is a synthetic cannabinoid that mimics marijuana’s euphoria-causing agent THC.

Clemson University chemist John W. Huffman developed the chemical in 1995 for purely experimental purposes, but its legitimacy and availability made it a popular alternative to marijuana.

The chemical is sprayed on herbs and sold as an incense called “spice”, but is more often smoked to get high—JWH can be up to five times more potent than marijuana.

Little is known about the actual effects of the drug, but some users have reported hallucinations, vomiting and high blood pressure. Others say it’s one of the best highs they’ve ever experienced. The drug is unregulated, which may explain why some users have experienced adverse effects. You can never be sure of what you’ll get.

Legislators and concerned parents continue to squabble about its legitimacy, but for now it’s still legal in most states. Huffman told The Observer he’s just surprised it didn’t catch on sooner.

"I've come to the conclusion,” he says, “that if an enterprising person wants to find a new way to get high, they're going to do it."

The bottom line is that more investigation is needed to determine the effects of the drug’s use. Read the original article on K2 in Newsweek, or see Huffman’s interview in The Observer.