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72 Hours. In as little as 72 hours after you quit smoking, your lungs will begin to heal themselves. Airway inflammation decreases and the bronchial tubes begin to relax.Breathing becomes slightly easier and lung functionality begins to increase. Weeks to 3 Months. It is between a couple of weeks and a few months that your lung capacity increases significantly; lung capacity can improve by as much as 30 percent. This is most noticeable as walking and other physical exercise becomes easier.
In fact it is not unusual for you to feel worse for a short time immediately after quitting smoking, but that settles out within a few months as you cough out all the mucus that has built up, and the lungs start to heal and new mucus is no longer made.eport Abuse. 10 years to bring ure risk of heart failure back to that of a non smoker 20 years to bring ure risk of cancer back to that of a non smoker. Ure lungs will never completely heal from the damage-but they will heal 99% after 20 years or so.