FDA Approves Juul's Tobacco and Menthol E Cigarettes FDA reverses order taking Juul vaping products off the market in US, opens door to possible authorization ABC News Juul Betrays Its Customers by Pre Emptively Eliminating Most of Its E Cigarette Flavors 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.