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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.
After you quit smoking, a lot of good things happen to your body very quickly. Within just 20 minutes, your heart rate and blood pressure go down. Within 12 hours, the carbon monoxide levels in your body go back to normal. And within a couple of weeks, your circulation improves and youâre not coughing or wheezing as often. But some pretty unpleasant things happen right away, too.