If that's a reference to a spate of "popcorn lung" cases of THC vapers, where it's suspected that the juice was laced with vitamin E, you might as well say that Tylenol is deadly because someone once spiked it with cyanide†. Don't put junk in the juice, regulate the ingredients. I'm saying this as a non-vaper and non-smoker, if it makes any difference.

†I know, I know, acetaminophen _is_ deadly is you overdose on it. That's not what I'm talking about here.