I'm not sure if you wanted opinions or were just making an observation now that you don't smoke.
I'll give you mine juuuust incase.
First off, please don't be one of those bitter ex-smokers that acts like the sight of a cig makes them sick. I come across people like that and want to slap them, grab them by the ears, and say "you idiot, you did it for years." Not saying you are like that.
Second, I know first hand, if you want your man to stop smoking and start
vaping, the wooorst thing you can do is pressure him. Us guys hate that crap. In honesty my wife tried to pressure me at first. You know what? didn't make me wanna quite smoking at all. What made me decide to try vaping was watching how she stuck with it and really enjoyed it so much. Not to mention having to go out in the GA summer heat to smoke while my wife happily puffed away on her PV from the comfort of our couch. I would find myself bumming a draw from her PV, until I was like "yeh I gotta get one for myself." Other than that, if he decides to start vaping, don't let him get a tiny cig shaped model, everyone knows they suck. I hope this helps. Good Luck