Hello Carolyn:
Much of the discoloration of the lung will remain, although the chemicals deposited do start to lose their potency. Where the real benefit of quitting can be seen is at the cellular level. While the underlying tissue remains discolored and destroyed, the lining tissue of the bronchus does in fact return to normal and is cleared out. While this may not look impressive to the naked eye, it is of great importance--for this is the tissue where the vast majority of lung cancers actually occur. That is why quitting smoking and allowing this tissue to regenerate plays such a paramount factor in reducing the risks of developing lung cancer.
Read that article and if you then have any follow-up questions feel free to get back in touch.
Joel
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