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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.
1 What Happens to the Lungs when You Quit Smoking?(3)â¢ Previously, LHS researchers made available results indicating that both sexes profit from quit smoking but this new study proves that women benefit more than men as their lung function improved speedily after one smoking-free year. 13. 2  How to Clean Your Lungsâ¢ Making the lungs free of toxins is one of the foremost challenges after smoking cessation. 3  This is because cigarette smoking tends to leave the lungs not only contaminated but also dehydrated and possibly swollen. 4  One thing to keep in mind is that the lungs cannot be cleansed completely.