The drug was legally available at gas stations, convenience stores and the internet until last year. Now it's illegal, but still around and producing toxic reactions in those who smoke or swallow it. Many are adolescents and young adults.
A report in the journal "Pediatrics," says the drug does not show up on drug tests for marijuana. Emergency room doctors are now being warned to watch for symptoms. These include: agitation, racing heartbeat, high blood pressure and convulsions.
