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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.
Some damage to lungs and heart will heal if you quit smoking. Photo Credit Getty Images. Your body constantly repairs itself, growing new bone, skin, blood, heart and lung cells daily. Your bodyâs regenerative ability makes it possible to overcome infections and injuries.nflammation of your bronchial tubes caused by smoking restricts the flow of air to your lungs. According to PAMF, within 72 hours after cessation, your bronchial tubes begin to relax, and air flows more easily into and out of your lungs.