Nigh on 2 years for me....
That said, last Friday night we went out for a bit of a pub crawl with an old mate of ours (he is an on again off again smoker), being half tanked and child free for the evening I found myself suddenly smoking again while we were at the pub.....
Woke up the next morning and went the the Tattoo Expo, didn't feel like a smoke at all and still don't.
I think I've found a comfortable spot with smoking, I get zero urges other than times when we go out as a child free couple hitting the town, which probably only happens 2-3 times a year, I'm comfortable smoking on those odd occasions.