I quit just short of 4 years ago. I cannot really say it was that hard, but the desire to have "just one" is a stronger nag than a bad woman. Some days, it takes a lot of internal strength to not smoke. Helps to be broke I guess. Anyway, congratulations on a most intelligent choice. Feel free to lean on me all you need for support.
I still notice little positive things every so often, like how much better I recover after a long hard climb (and how that still is improving), or how much better my eyes feel when they are not bedeviled by smoke.