if she is still smoking, you will probably not mind the smoke for a long time since you will continue to be used to the smell, i would suggest using the psychology of your situation in your favor.
you say you sit in bed puffing while watching tv, perfect, there are differences between your method and hers that you might be able to use to your advantage.
First: let her try the flavors. dont be forceful about it, just be all "ooohhh nice this watermelon rocks! here try!"
Second: make sure you have a spare battery always charging, and close by, the image must come across that its as easy to
vape as reaching for a lighter.
and the most important: flaunt your health improvement, not in a bad way, come back from a run or something and when she asks you what you were doing you say something very passive agressive like "ive been feeling so good lately i thought i could take on some extra excersise!"
these things are passively agressive as oppose to active agressive, they portray the idea that switching is a viable option without making her feel like youre attacking her choice. for now thats all i would reccomend since she shows no interest in quitting you can take advantage of that i saw.