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. Juul CEO steps down as company agrees to stop advertising Juul e cigarettes win FDA authorization, sources say FDA officially bans Juul e cigarettes in the U.S.: Here's why nj.com