Normally, even after quitting smoking, the lungs do not return to normal.
Smoking causes damage to human lung tissue, usually irreversible. Long-term smoking can cause serious harm to the immune function of the respiratory tract and lung function, and can easily cause pulmonary herpes, emphysema, chronic bronchitis, chronic obstructive pulmonary disease, etc. The damage caused by these diseases is irreversible, and quitting smoking does not restore lung function to normal levels.
The degree of recovery of lung function after quitting smoking varies from person to person, but none of them can be restored to the state before not smoking. This is especially true for patients with smoking-induced chronic obstructive pulmonary disease (COPD), which causes an irreversible decline in lung function that can only be slowed down by medical means.
Smoking is detrimental to one’s own health and that of one’s family, so smokers are advised to quit early. When it is difficult to quit smoking, you can go to the smoking cessation clinic of a regular hospital to seek professional medical help.