I quit about half a year ago and the thing that surprised me most is not the smell coming back or the money saved but the waste of time smoking is. I smoked 15-20 cigarettes a day and maybe for half of them I took an extra break, which amounted to at least half an hour per day. But for the other half I needed a bit extra time as well, plus I had to buy the cigarettes, I had to think of taking the stuff with me when going out and then the lighter was empty etc. Overall, I think I lost an entire hour every day to them and I got stressed more than I am now without them. That was a very strange realization.

My success trick to quitting was more sleep by the way. Maybe it helps you as well to spend 1-2 hours more in bed per day for a few weeks.