I can't speak for others but I have No Doubt that I would return to my former 3 ppd habit... Or more.
I did not find that magically taking 18 months off smoking for pregnancy and nursing bought me ANY relief. I was quickly up to my "norm" back then within a week or so after my little one weaned. Oh sure, I had the "just a few here and there" first, but tobacco won.
With me, tobacco ALWAYS wins. You don't smoke the way I do for FUN. You do it because you are completely addicted.
Also a good motto "Every quit is different." I have lost times of the number of times I tried to quit and each time was harder/easier. I have NO clue if I'd be able to return to vaping successfully, so have no desire to "test" my theory that I would be smoking as much as, or more than I was before.
That's a niggling little "I don't want to quit" thought if you ask me. I'd quash it. Just go places where smokers are getting treatment for whatever, and talk to them about it, if you feel the need.
I have no need to "retest" my addiction, and no doubt that I would quickly be back up to 3ppd.
Anna