Do Juul Pods Contain Formaldehyde FDA orders Juul e cigarettes off the market over safety concerns GEEKVAPE Legend L200 Classic User Manual Features, Instructions, and Warranty Geek Bar Keeps Firing After Hit? Find Fix in Simple Steps VapeDeal.com DYK? Vaping coats lungs with potentially harmful chemicals. This can include chemicals such as: Diacetyl: This food additive, used to deepen e cigarette flavors, is known to damage small passageways in the lungs.