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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.
This is due to a number of regenerative processes that will begin to occur in your body; your circulation will improve, and your lung function will also improve significantly. After two or three weeks without smoking, your lungs may start to feel clear, and you'll start breathing easier (AHA, 2012) .For most smokers, withdrawal symptoms dissipate about two weeks after quitting.moking accounts for 90 percent of lung cancer deaths worldwide. It may take 10 years, but if you quit, eventually your risk of dying from lung cancer will drop to half that of a smoker's (CDC, 2004).