Yes: but it depends on how much damage is already done. If there is chronic bronchitis and/or emphysema (COPD), smoking cessation will allow a little bit of healing but, more importantly, NOT DOING MORE DAMAGE. If it is milder, complete healing may occur. It takes years for things to get back to normal. The black coloring in lungs (anthracosis) will not change, but doesn't effect function.
Answered 9/28/2016
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