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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.
Even for the heaviest smokers, withdrawal symptoms will go away no more than several months after quitting. The one-year mark is a big one. After a year without smoking, your risk for heart disease is lowered by 50 percent compared to when you were still smoking (CDC, 2004).Another way to look at it is that a smoker is more than twice as likely as you are to have any type of heart disease.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).