Revisiting airway epithelial dysfunction and mechanisms in chronic obstructive pulmonary disease: the role of mitochondrial damage American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society 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 The Truth About What Vaping Is Doing to Your Body American Lung Association , New research from the University of California, Riverside reveals concerning risks of e cigarette use for lung health. The Scientific review finds e cigarettes likely cause lung and oral cancer