I smoked from high school until I was 41. I just ran out of cigs one night and never bought or bummed anymore. I had no serious health problems before or after. I have always had sinus attacks and continue to do so. I gained weight over several years and could stand to lose a few.
It has been 10 years since I had one and have never really missed them. For a few years it didn't bother me to be around other people smoking and then one day they just started STINKING to me.
In all I don't feel any better or worse for quitting. My family and friends have probably benefitted more from my quitting than me. I saved a LOT of money but I spent it on Mercedes parts!!!