Let's fast forward a few years from now to the point where we determine that e-cigarettes contain some sort of cancer or lung disease-causing product / additive, just like we figured out with cigarettes decades ago.

What I don't understand is why the FDA will not outright ban them immediately. (Well I probably do, and the answer is lobbying.)

Regardless of your stance on whether or not the FDA _should_ ban ingredients that pose health risks (government intervention on liberties et cetera), the fact is that this is the FDA's policy. It bans harmful ingredients (usually).

So with that policy in place, what's the deal here? If and when e-cigarettes are found to contain a chemical that is directly linked to cancer or lung disease, will the FDA ban it? Or will it conspicuously let it slide, and just slap a warning on it, like it did cigarettes?

https://www.fda.gov/cosmetics/cosmetics-laws-regulations/pro...

https://www.fda.gov/food/food-additives-petitions/food-addit...