Juul Betrays Its Customers by Pre Emptively Eliminating Most of Its E Cigarette Flavors FDA reverses order taking Juul vaping products off the market in US, opens door to possible authorization ABC News Juul e cigarettes win FDA authorization, sources say 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.