HI im off fags 6 years and i keep off them by making myself run 5 or 6 miles every morn,sometimes fast sometimes slow,it was a promise i made myself and iv kept,when i go for run in the morning i get so full of clean air that i dont want a fag,a doctor once told me that to jog and be a smoker was more damaging to the lungs than just being a smoker and not running,today seems like a nice day to stop,and yes it does make a difference to trainning im fitter and run better so good luck and try it yourself