Well, Day 3 is almost done. Supposedly my body is nicotine free now and physical withdrawal symptoms have peaked and will gradually taper off over the next week or two. Now starts the hardest part. The psychological withdrawal. I've got to retrain the mind that I don't smoke anymore. That it's better to ride than smoke.
I've already started that. Most of the time I can just ignore the craving. Occassionally it's impossible to ignore. Then it's around the block on the bike, day or night. The craving is gone within a 100 yards.
Even though it's only day 3 I can already notice a slight increase in lung capacity. Instead of huffing and puffing after one time around going mostly up slope, now I'm only huffing.

It can only get better from here, one day at a time nicotine free.