In 2019 there was a lung injury outbreak and tragically some deaths in the USA. This was not caused by people vaping nicotine liquid. The people who fell ill had been vaping illicitly-produced THC, which is the chemical found in marijuana (cannabis). In some THC e-liquids, an oil-based thickener called Vitamin E acetate had been added to make people think it was a higher quality product. Vitamin E acetate was the substance that caus