E Cigarette How E Cigarettes Work, Health Risks & Teen Use EVALI: New information on vaping induced lung injury Harvard Health Conventional and multi omics assessments of subacute inhalation toxicity due to propylene glycol and vegetable glycerin aerosol produced by electronic cigarettes ScienceDirect How bad are ecigarettes? What can we learn from animal exposure models? Marczylo 2020 The Journal of Physiology Wiley Online Library Is Propylene Glycol Dangerous to Inhale? Safety and Use in E Cigarettes SMOKO E Cigarettes Researchers at the University of California, Riverside, found that heating propylene glycol, the main ingredient in most e cigarette liquids, can produce two toxic chemicals, methylglyoxal and acetaldehyde, which damage lung cells. Using