People who have smoked for a short time and do not have underlying medical conditions can usually recover their lung capacity after quitting smoking.
If the smoker has not smoked for a long time and has no underlying disease, the lung capacity can be restored by quitting smoking and increasing physical activity. If you have chronic lung disease, smoking will reduce the oxygen content of the alveoli. After quitting smoking, your lung capacity may not improve in the short term, but long-term aerobic exercise, such as running and swimming, can improve your lung capacity to a large extent.
In order to restore lung capacity, you can actively carry out pulmonary rehabilitation training after quitting smoking, such as through abdominal breathing training can increase the amplitude of diaphragm lifting and lowering to improve lung capacity, you can also use respiratory trainers, blowing up the balloon, strength and stretching training such as chest expansion exercise, etc., which will also help to improve lung capacity.