Yep. I quit smoking via 3 years of vaping and tapering down on nicotine. I've referred and seen no less than a half-dozen people I know do the same - some of the hardest smokers i've known (including my own fathers 40 year+ pack a day habit)
If anybody asks i'll always turn people onto vaping - even if they don't ask i'll push them towards it, nothing has gotten even close to working like vaping has a a quit mechanism
I really strongly believe that this is an area where regulations lag real-world experience and there are a ton of vested interests in preserving the existing regimes of either smoke tobacco or nothing at all