If too much smoking causes chest tightness, it is usually because the nicotine and tar components in cigarettes cause ischemia, narrowing, and spasm of the coronary artery vessels, triggering lack of oxygen and ischemia in the heart muscle cells, resulting in the onset of chest tightness and shortness of breath. Once the above situation occurs, smoking must be stopped quickly and can be relieved by oxygen therapy, such as oxygen bags or oxygen cylinders at home, oxygen therapy can be carried out, and when possible, you can go to the hospital to perform oxygen inhalation of screen wall oxygen. However, oxygen should not be administered at a high flow rate for a long time, but at a low flow rate and continuously. In addition, patients can be given sublingual nitroglycerin or quick-acting heart pills, especially when the patient has symptoms of precordial pain, you can give the above-mentioned nitrate drugs or Chinese medicine, to improve the effect of myocardial cell ischemia and lack of oxygen.