Well I smoked my last on Sat AM (7:50) and have been on using the inhalator since.
Last night I went to my regular Taekwondo session which our instructor had promised, on Thursday, would be a tough fitness based session. Well I could not believe the benefit that just 2 days without cigs had, my endurance and stamina levels were incredible compared to "normal" and surprised not only me but the guys I train with. It must have been to do with more oxygen in the blood (or less carbon monoxide) but I found it took longer to get muscle fatigue and I didn't get a stitch which I would normally do!
This is the most clear practical demonstration of the harm cigs have been doing to me, and quite an incentive to keep off them. I suspect that this will be the most noticeable single improvement to my fitness as a result of quitting the old cancer sticks but I'll keep it up and see.