Nation Half of THC vape samples have risky Vitamin E acetate, but pesticides, metals found too October 11, 2019 Jayne O'Donnell, USA TODAY Comments Off on Half of THC vape samples have risky Vitamin E acetate, but pesticides, metals found too Vitamin E is a likely culprit, but metal fume poisoning and cadmium poisoning are also possible. Cheap vaping devices would increase the risk.