What do you mean "Will vaping ever be cool?" It already is "cool".
It's one of the biggest fads to land, at least in west coast CA, primarily among kids in their late teens/early twenties. The number of non-smokers (no pot, no hookah, no cigarettes, no other smokeable drugs) I see asking me how to get into vaping is, actually, a lot more than I thought.
It saddens me, to see otherwise perfectly healthy people ask me, in essense, "How do i turn myself into a faux smoker?" It's almost like the popularity of smoking in the 20th century, except one century late.