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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.
Within 20 minutes after you smoke that last cigarette, your body begins a series of changes that continue for years 20 minutes after quitting, your heart rate drops. 12 hours after quitting, carbon monoxide level in your blood drops to normal.After 24 Hours: Your lungs begin to clear out accumulated mucus and tar.ithin 20 minutes after you smoke that last cigarette, your body begins a series of changes that continue for years 20 minutes after quitting, your heart rate drops. 12 hours after quitting, carbon monoxide level in your blood drops to normal.