As a 20+ year smoker, I am looking forward to noticeable improvements in lung function, etc. I haven't had 'smoker's cough' or regular morning hacks except after nights of extreme smoking (at clubs, etc), but if nothing else know I will have greater endurance once my lungs start healing from the abuse!
So far, my biggest noticeable symptom is decreased taste (so far, few of the flavors taste like very much but I get the 'idea'), and so I cannot wait for my taste buds to recover and begin to truly enjoy the variety of flavors we have to choose from!