I was thinking the exact same thing. She will use it very rarely, laying around watching tv etc. She will haver no interest in ever leaving the house with it. More of a something to do kinda thing. Me on the other hand, I was a pack and a half a day smoker. I wont leave the house without mine.
My wife is in a somewhat-similar situation. When we first met over a decade ago, she smoked occasionally when out with friends. She is one of the lucky ones that was able to just "stop" smoking, mostly because of migraines. Has no desire for regular cigs at all.
However, when I started vaping in Feb 2011, she tried out a few of my initial non-tobacco flavors and kinda liked them. The nicotine in my first batches was a total turn-off for her taste and sensation wise.
Now that I've gotten down to zero myself, she occasionally puffs on my old KR808 that I no longer use with some fruity flavors. She goes days at a time between encounters, but does enjoy the flavors (so far I've been able to mix her up some fruit+70/30 pg/vg).
I was concerned at first myself, but now over 6 months in, she is doing just fine. I personally think your wife will be just fine with vaping zero nic from time to time.
on a sidenote: it has helped with chocolate cravings, which is a soft spot for her!
