E cigarette aerosol isn't just water vaporit contains toxic chemicals like formaldehyde and acrolein (yes, a weed killer!). Vaping can lead to lung disease, Popcorn Lung, and even a collapsed lung. Plus, secondhand Transport and Mitigation of Exhaled Electronic Cigarette Aerosols in a Multizone Indoor Environment Aerosol and Air Quality Research Vaping SWATFlorida E Cig Aerosol Generation for Toxicological JoVE Journal