Others have already stated, all the "research" where all done by anti-vaping people... the "tests" were done under extreme conditions that not a single vaper would do voluntarily, even under terrible conditions. They burned the coils and winks and boiled the liquid to extreme temperature, and using methods that not a single vaping device could do similar.
Even the "bad" chemicals found, where so small in quantity that everyone actually inhales a lot worse from simply walking down the street next to cars or living in cities. Even new carpets and other items gives off trace amount of chemicals that are higher than what registered for vaping.
So as others have already said, unless you get dry hits, there's absolutely nothing in vaping that any single person, lab, scientist, has been able to find as being bad for anyone. At this time the popular saying is "it's 95% safer than cigarettes, and for that 5%, we have no idea." In other words, they are keeping that 5% for the witch hunt... odds are that IF there is something discovered, it could be 3%, 1%, 0.01% ... or nothing at all.
At this point the only real negatives have all been human error with mech mods/coils being badly done, batteries left in bad circumstances that caused them to blow, people using wrong chargers on cheap crappy e-gos (mostly fakes), people using bad stuff to vape instead of proper liquid..
Even the diacetyl scare.. the "huge and scary" quatity found was something like 100 times less than in cigarettes, and less than in a LOT of food products that people eat every day.