The flavors contain Propylene glycol. As do a whole lot of foods. It has been banned in Europe, but not here, where the FDA is a federal bureaucracy, whose members are politically appointed. Uncle barry, put the ......"former"...... head lawyer from monsanto, as the head of the FDA. The rest of the top echelon is made up of members of other big pharm, and chem ..... uh...... former members, like dow, searle, phizer, etc. . It is not safe as the FDA says. It is the primary ingredient in antifreeze, replacing a more dangerous form. It gives the sweetness to flavors, and is in everything from cake mixes, ice cream, to even beer, to keep the foamy head.
It isn't always listed. I guess it comes down to what you want to get cancer, emphysema and other lung diseases, etc. from, tobacco, or antifreeze. I know the e cigs, have helped a lot of people quit. My Girlfriend's Sister, and Brother n law, are trying to quit smoking, using them. Anyway, that is my two cents worth, of dire info. Glad you were able to quit. I quit cold turkey, back in my late teens, and then smoked a pipe, and cigars, in my twenties, and then stopped altogether, and can't stand to be around cigarette smoke now. I hope you can stay rid of them. You will find food tastes a whole lot better, and you will smell a lot better than like an old ash tray.
Wayne