Certainly my observations are pure anecdote, and only really a handful of people; all of whom started smoking before vaping was available. That said, a cigarette is a pretty impressive way of delivering nicotine, which is why they are so addictive. It's not hard to imagine that someone who's become addicted to nicotine via vape would then try other delivery methods and find them more satisfying.

That said, I do think that vapes as a replacement for an existing tobacco habit is a nice idea and it makes sense that it would be much safer. The issue is just that I have not known people to stick with them.