Well there is always going to be two sides to the fence Terry
http://www.ecigarette-research.com/web/ Sudies have been done and are still being done, the vaping community welcome all of these studies and some form of control has to be done to stop the import of crap stuff. Nothing in this world is 100% safe but if you compare 3 known products in an E-Liquiid to over 4,000 in a cigarette, of which they do not know what a lot are even, I know what I would sooner use. You say a lot of people get hooked on them, I think it is more a case of getting hooked on a lot of the hardware that is out there from a collective point .Ye`h people are addicted to Nicotine as it has natural calming properties, but then no more than people drinking coffee or alcohol, but has been proven to be non carcinogenic,and unless admitted orally or high concentrate levels absorbed through the skin, is no more dangerous than any household cleaning product you can purchase and have lying about the place.