I just recently past my 2 year anniversary. I smoked 37 years and when I received the first kit, I never looked back, although out of curiosity- about 5 days in... I asked to hit a smoke and one hit was all I did and it was absolutely horrible! I'm really happy to this day that I quit!!
I remember mentioning to my wife a few months ago that I hadn't smoked for two years. To which she replied "so, I haven't smoked for 70".