Lower response to vaccines Another of the significant negative effects of smoking is the lower immune response smokers experience with vaccines
Now, lets take a look at the chemicals found in e-cigs and vapors: Nicotine (in certain e-juices and e-cigs, but not all) Propylene glycol (not the Ethylene kind) which is used in inhalers and is generally recognized as safe by the FDA Vegetable glycerol using in medication, cosmetics, and food Thats it
(PubMed) Sazonov V, Maccubbin D, Sisk CM, Canner PL
Not a warning sign
and B) methanol and 25 mM formic acid
Once more, it relies on the amount of food eaten, how thirsty you become, your health status, race, sexuality, how well your liver is functioning, and your medications, among other factors