How long it takes to quit smoking for 10 years before the lungs are clean depends mainly on the patient’s individual physical condition, and the exact time cannot be specified and cannot be generalized. The biggest effect of smoking on the lungs is the damage to the cilia, and the recovery varies due to the individual’s physical condition. After quitting smoking, the state of the lungs can be gradually restored, usually about 1 week after quitting smoking, the lung cilia can be regenerated, and the breathing ability will be enhanced accordingly. It takes 6-12 months for the lung cilia to gradually return to normal to effectively remove dead and damaged cells, and the lung function of smokers who quit can generally be gradually enhanced after 1 year. Therefore, how long it takes for a 10-year smoker to quit smoking to have clean lungs is mainly related to the recovery of cilia, as well as the amount of smoking, age and other factors. In addition, 10-year smokers should maintain good lifestyle habits when quitting, and it is recommended to go to a regular hospital smoking cessation clinic for examination and evaluation to improve the record of smoking cessation experience in order to quit smoking early and benefit health.