Really? Where there no such problems with conventional liquids? I'm not aware about any cases which didn't involve VitE/oil but would prefer to be sure there we

Really? Where there no such problems with conventional liquids? I'm not aware about any cases which didn't involve VitE/oil but would prefer to be sure there were now such cases known to anyone and cite some credible sources for his. Occasionally people would bring this topic up and I want to respond "that's all about vaping vitamin E in black market THC oils, just stick to PG+VG from reputable vendors" but don't feel credible enough.