Man, I love smoking. I smoked Dunhills for about 18 years until they changed them and then Mild Seven Lights for the last few years. Never really smoked more than a half-a-pack a day unless I went out and night and really partied. Have always kept myself in good shape though - I'd smoke before and after surfing, before and after running, while riding, whatever!
I quit a few times in the past, but my heart wasn't in it and I'd go back to it within 6-months. But I recently turned 40, had my first physical since college (everything fine), got my first pair of eyeglasses, and well...it just seemed like the time to quit. Haven't had one in almost a month.