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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.
Report Abuse. here are many benefits to quitting: 20 minutes after you stop smoking, your heart rate slows down to a calm, steady beat, lowering your blood pressure. Eight to twelve hours later, the dangerous carbon monoxide that smoking causes in your blood has now dropped to a normal level.eport Abuse. 10 years to bring ure risk of heart failure back to that of a non smoker 20 years to bring ure risk of cancer back to that of a non smoker. Ure lungs will never completely heal from the damage-but they will heal 99% after 20 years or so.