The changes in the lungs after 1 year of smoking cessation are generally reflected in the recovery of bronchial mucosal ciliated cells and the decrease in the chance of respiratory tract infections. 1. Recovery of bronchial mucosal ciliated cells: Generally, after quitting smoking, the damage to ciliated cells caused by nicotine and other harmful substances will be removed, and bronchial mucosal ciliated cells will regrow in the endothelial lining of the bronchial tubes, and coughing and other manifestations may occur at the early stage of quitting smoking. This is the process of recovery of the mucous membrane of the airways, and some of the wastes deposited in the airways will be discharged. 2. Decrease the chance of respiratory tract infection: generally after quitting smoking, the ciliated cells of the bronchial mucosa swing to enhance the lung clearance ability to restore, can help clear the respiratory tract of germs, reduce the frequency of respiratory tract infections, respiratory tract infections secondary to a variety of lung function damage will be reduced accordingly. After quitting smoking, you can exercise moderately on a daily basis and eat more fruits and vegetables to ensure better adaptation of the body.