ANSWERS: 1
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If I understand the biology of what happens to ones lungs correctly, then no. Smoking destroys the avioli in one's lungs. Once these are gone, they don't regrow. As they are destroy, the smoker loses lung capacity. So, when a smoker quits, he stops doing the damage to his lungs, he might even regain some lung capacity as his lungs clean out the residual junk from when he was a smoker. However, he will never recover lung capacity to the point of being equal to what he would have had if he had never started smoking in the first place. He certainly won't have more lung capacity than someone with the same sized lungs who never started smoking in the first place.
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