Among a rash of cases involving reduced respiration and chest pains among vape users, the US Food and Drug Administration is concerned about the potential risks of E-cigarettes. Said cases were more common in, though not exclusive to, individuals who utilize THC additives while vaping. In light of these findings the FDA heavily discourages the use of ‘black market’ E-cigarette THC liquids and recommends cessation of vaping until more long-term health studies are conducted.
See Full FDA Statement Here