Just posted in another thread, that I started, that moderation is more liberating than cessation. I stand by that claim as I've gone cold turkey from smoking longer than just about any vaper has quit thru vaping.
When I went cold turkey, after 30 days I gave myself full permission to smoke. Then went another 8 years not smoking until I had my next one. I think that 'full permission' thing is best place to be mentally.
I fail to see an actual problem in having a smoke every once in awhile, which several in this thread have already posted about what 'once in awhile' actually means. I also think it is far less a problem (psychologically) than the ex-smoker who needs to hate on smoking to ensure they don't go back to that place of loss of self control from smoking addiction. I just think it isn't possible to lose that control with vaping in the picture. You'd have to make the mental determination to never vape again to suddenly revert back to a heavy user of smoking. Post #21 in this thread nails that point.
So many ex-smokers, now vapers, claim the taste of smokes are just god awful. And while I can relate to that, it seems to miss the point (entirely) that smoking is an acquired taste. When the temptation arises and moves toward a craving, your mind is remembering the good taste, the one that you had acquired, were accustomed to, and that you did actually enjoy. If the temptation is there, but your mind is conflicted, believing that just one smoke ruins some lucky streak of cessation, then those one or two drags are going to be met with hate. IMO, you are far better off just waiting that strong craving out for like 10 minutes and not smoking. I had those when I went cold turkey and I honestly can't recall one that lasted more than 10 minutes, even while the first 3 minutes of those 10 seemed like an hour.
But if the temptation is there and you aren't coming from a conflicted mind, then I say enjoy the smoke, the taste, the experience for what it is, and realize that with vaping in the picture, there is almost zero chance of a relapse. Moderate smoking is very very nice, even while vaping rules.