A new study has found that when the main ingredient in most e cigarette fluids is heated, it forms two toxic chemicals capable of harming human lung cells. The research, published in Frontiers Pathogenesis of ECigarette Vaping Product UseAssociated Lung Injury (EVALI) Petrache 2023 Comprehensive Physiology Wiley Online Library Health Effects of Vaping Scientific review finds e cigarettes likely cause lung and oral cancer The Truth About What Vaping Is Doing to Your Body American Lung Association