Smoking too much chest tightness and shortness of breath may be chemical stimulation, lung disease, heart disease and other related. 1. Chemical stimulation: cigarettes contain a large amount of carbon monoxide and tar and other substances, long-term inhalation will cause chest tightness and shortness of breath phenomenon, may also be accompanied by coughing, phlegm symptoms. 2. Lung disease: smoking refers to the inhalation of smoke into the lungs and then exhaled process, and into the lungs need to go through a series of organizational structures, such as trachea, bronchial tubes, etc., which will cause some damage to the entire system, and then the symptoms of chest tightness and shortness of breath. 3. Heart disease: tobacco caused by coronary artery spasm, coronary artery spasm refers to the epicardial coronary arteries under the transient contraction, which will lead to insufficient blood supply to the heart, chest tightness and shortness of breath symptoms. Smoking chest tightness and shortness of breath, you need to quit smoking in a timely manner, if you can’t relieve yourself, you should consult a doctor in a timely manner.