Chemicals found in e cigarettes could cause lung problems The Pharmaceutical Journal Electronic cigarettes have been branded 'harmful' by the head of WHO The Independent EVALI and the Pulmonary Toxicity of Electronic Cigarettes: A Review Journal of General Internal Medicine Springer Nature Link E Cigarettes and Vaping PPAC Central E cigarette users could be at risk from dangerous 'popcorn lung' disease, Harvard research finds The Independent The Independent