After Effects Of Quitting Smoking

Specifically, is it possible to be able to exercise and run as if you've never smoked a cigarette before after leaving?

Smoking is a major risk factor for heart disease and heart related diseases. Quitting smoking now greatly reduces your chances of developing these conditions. When smokers quit, within twenty minutes of smoking that cigarette last, the body begins a series of changes.
At 20 minutes after quitting:
pulse rate decreases, blood pressure reduction
body temperature of hands and feet increases
8:00:
oxygen level in blood increases to normal
At 24 hours:
chance of a heart attack decreases
48 hours:
nerve endings start regrowing
sense of smell and taste is enhanced
Less than two weeks to three months:
Circulation improves and lung function
1 year:
excess risk of coronary heart disease is half that of a smoker
The long term benefits of abandoning
At 5 years:
5-15 years after quitting, stroke risk is reduced to that of people who have never smoked.
At 10 years:
risk of lung cancer drops to as little as half that of continuing smokers
reduces the risk of cancer of the mouth, throat, esophagus, bladder, kidney and pancreas
At 15 years
risk of heart disease is now similar to that of people who have never smoked
risk of death returns to nearly the level of people who have never smoked

Unless you have already developed a severe emphysema or love him, yes, it is possible to get a little of your normal (non-smoking) of lung function back.

Yes. and I heard, after seven years without smoking, the lungs are completely repaired (except in cases of cancer, of course)
wow. Tiffiny good answer

NO! and I just do not care what anyone says, I was a heavy smoker, quitting smoking for 10 years, and yeah I was breathing better, do not cough as much, but the race was still done, and you know when you laugh so hard, it kills you? you just cough so bad that it hurts, so try not to laugh so hard smokers ... that never disappears. you still cannot laugh your butt off.

ok it contributes to your health, but you'll never be the way you were before you smoked.

Yes, it could take some time, but you can find a large amount of your lung function. Swimming is a great way to exercise during the reconstruction of your lung capacity.

Yes, as a matter of fact, your body will eventually return to what it was at any time you stop injesting a foreign substance ..

If you have lung damage, probably not. Check with your doctor and / or a reputable gym.