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 Two common flavoring chemicals in e cigarettes can damage lung cells 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 , New research from the University of California, Riverside reveals concerning risks of e cigarette use for lung health. The Vaping Lung Damage Resembles Chemical Burns OPB