All reported cases had a history of e-cigarette or vaping use, officials have said. Initial data shows that most people had a history of using e-cigarette products containing THC, that many people said they used both nicotine and THC, and that some reported using only nicotine products. Many people have also said they used black market or illicit THC products. THC is the active ingredient in marijuana that produces the high.

FDA officials said investigators from its Office of Criminal Investigations have been pursuing a parallel investigation since shortly after the illnesses were first reported this summer. That office conducts criminal investigations of illegal activities involving FDA-regulated products, arresting those responsible and bringing them before the Justice Department for prosecution. [Read More @ The Washington Post]