How bad are ecigarettes? What can we learn from animal exposure models? Marczylo 2020 The Journal of Physiology Wiley Online Library E cigarette, or Vaping Product, Use Associated Lung Injury (EVALI) Fact Sheets Yale Medicine 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 Increased vaping popularity amongst minors may put them at risk of severe lung injury Catalyst