You HOPE they don't find any bad side affects?
When people began smoking cigarettes they didn't know the bad side effects either.
Some people are claiming that "e-cigs are innocuous."
We don't know everything about them yet.
Hell, it's only been a few years since general use.
Are we to go through this again? Just because one can't "see" the exhaust,
it doesn't mean that it isn't there.
It's common sense that with a chemical process there are by-products.
Water vapor? Sure, what else? Does anyone truly know?
Keep your e-cigs out of my face please.
Sure e-cigs have only been in use for a short time, but hospital nebulizers and concert fog machines have been in use for many many years. They work the same way as e-cigs. The juice contains nicotine, propylene glycol, vegetable glycerin, flavoring, and water. PG is what produces fog in concert fog machines. VG is a food additive.
Many juices have no PG either, just VG, flavoring, and nicotine (you can get zero-nicotine juice too). There are no harmful byproducts. Nicotine in small amounts is present in the vapor though.