Chest tightness after smoking may be related to the following factors, such as bronchospasm, respiratory mucous membrane congestion and induced angina. 1. Bronchospasm: Smoking can cause irritation to the respiratory mucosa, which may cause different degrees of bronchial spasm, resulting in symptoms such as chest tightness and shortness of breath. 2. Respiratory mucosal congestion and edema: the smoke produced by smoking in a variety of chemical components to stimulate the respiratory tract leading to mucosal congestion and edema, causing bronchial stenosis, leading to chest tightness. 3. Induce angina: Smoking may induce angina symptoms of chest tightness, chest pain and shortness of breath. Smoking is harmful to health, it is recommended to quit smoking, if the symptoms fail to improve or even gradually aggravate, you need to consult a regular hospital in a timely manner, cooperate with the doctor to improve the examination and standardized treatment.