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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.
The human body is a healing machine. If you quit while you are healthy, your body can heal from most or all of the damage done by smoking. Within 72 hours of quitting, your lungs begin repairing themselves, and you will probably start breathing easier and better, as the bronchial tubes in your lungs begin to relax.fter 5 years, your risk of stroke will go down to that of a nonsmoker. After 10 years, your risk of lung cancer will go down by half, and your risk of other smoking-related cancers, like those of the mouth, throat and esophagus, will also decline.