About 17 months ago, there was an outbreak of a condition called E-cigarette and Vaping-Associated Lung Injury (EVALI), confined ONLY to those who vaped THC. Manufacturers cut the oil with vitamin E acetate, and this additive caused severe lung injuries and some deaths. After the additive was removed, there were few injuries.
The point is to say that these products aren’t regulated, and who knows what goes into those.