I smoked till about 8 years ago started about 13 and I'm 53 now. I can hike and ride my bike and if I go all out and get winded I can recover in about 5minutes so I guess thats good. I hate the fact that I wasted all those years and money on cigs when I could have been buying guitars and bicycles. I really don't miss it although once in a while great while I get a whiff of fresh smoke not the stale smell on peoples clothing (blah) and think mmmm that smells pretty good but those times are few and far between. I did take a treadmill test a couple of weeks ago and did 15 minutes at the max heart rate and the doc said get out of here your good