Since you are a former smoker, rather than try to talk you out of eCigs, I will just try to tell you my story of how I handled negotiating using eCigs with my wife.
Here is my experience. I quit analogs for over a year but really missed smoking, the actual physical activity of it. I got a eCig starter kit to play with, just to try out, with my wife's knowledge and understanding that I was just going to experiment/play with it and see what it was like. It might be lowest cost though to just get a disposable one to experiment with initially. I actually recently saw disposables on sale at a public quick mart, but you can get them online from a variety of sources, probably less expensively.
After I got the kit and tried vaping for a while, I decided that it fulfilled my desire to smoke sufficiently to ward off smoking an analog. Then, over supper one evening, I discussed it with my wife who is very anti smoking. I explained how hard it had been for me and that I was concerned that I might start smoking again (I had already lapsed a few times with a smoke here and there). I explained how important this was to me. I started negotiating with her about it, touching on points I knew were of concern to her.
I said I would only do it sort of "in the closet", not in front of her or people we knew. She was not happy about it initially, but said it was preferable to the possibility of my starting smoking again.
I told her that it would not produce any bad smell like analogs do, and I think that was important to her. I told her it did not have the quantity of carcinogens analogs have, and that nothing was actually burning-that it was just a vapor, not smoke, and I think that influenced her. I told her we didn't have to discuss the topic anymore if it made her uncomfortable, I just wanted to make sure we were agreed about it. I think that made it easier for her.
Finally, (and this might be too strong or overkill for some people) I also said I had decided to try this, that I was an adult making my own decision, and I was not asking for permission, I was letting her know about what I was going to do.
I apologized for being so adamant, but said that I had made the decision because I thought it was in my best interest to do so because I wanted to avoid smoking analogs.
So I have stuck to my agreement and compromises, and it has worked out fine for both of us. She is now used to and comfortable with my vaping. We do discuss it occasionally when she wants to, and she has even tried a puff or two of some of the flavored eLiquids I have gotten like Cherry to see what they are like. I feel lucky my spouse worked with me to come to a mutually agreeable solution. And after a few weeks using eCigs I stopped having any desire for an analog. There are just so many pluses to eCigs compared to analogs that when I have that urge, I'd rather go vape than smoke.
I do want to mention that I would prefer to go 0 nic myself, but have found I just can't reproduce the feel of smoking sufficiently (the throat hit) without a medium (say 14 to 18 mg) level of nicotine. However, not having smoked for so long, you may get a throat hit just from zero nic that is sufficient. I would certainly try that and alternatives like 0 nic Menthol (I hear Totally Wicked's is good; I make my own Menthol ejuice) before going with an eJuice with nicotine. I hope this helps.