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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.
8 Hours. 8 hours after you quit smoking, your body will begin improving. In fact, within these first few hours is when the very first noticeable effect of no longer smoking is seen: the amount of oxygen in your blood will begin to return to normal levels, even if youâre already vaping. to 9 Months. If you stay away from tobacco cigarettes and continue vaping for 3 to 9 months, you should notice that wheezing, coughing, and shallow breathing have reduced in severity or gone away.