Coughing after quitting smoking may be due to the recovery of respiratory function such as the recovery of cilia function, or it may be caused by chronic bronchitis and other respiratory diseases caused by long-term smoking, as follows: 1. Recovery of respiratory function: long-term smoking can damage the airway epithelial cells and cilia movement, so that the airway purification ability decreases. After quitting smoking, the cilia in the lungs can be repaired, while the harmful substances such as nicotine and tar are eliminated from the body, thus causing cough. 2. Respiratory diseases: long-term smoking may cause chronic non-specific inflammation of the trachea, bronchial mucosa and its surrounding tissues, such as chronic bronchitis and other diseases, whose main manifestations are chronic cough, coughing up sputum, with or without wheezing. In the acute stage, cough and sputum can be relieved with aminoglutethimide and actively treated with anti-infective antibiotics such as levofloxacin. There are many reasons for coughing, and it is not always caused by smoking cessation. If coughing is repeated or symptoms worsen, it is recommended to consult a doctor in time to clarify the cause of the disease and treat it under the guidance of the doctor. Smoking is harmful to your health, so quitting as soon as possible will help your health.