You should not smoke after heart artery bypass surgery. Smoking may cause atherosclerosis and other diseases to recur, so it is recommended to quit smoking in time. Smoking is the most important cause of atherosclerosis. For those who have undergone arterial bypass surgery, their cardiovascular condition itself has already had some damage, and if they continue to smoke, it may cause even more serious damage or relapse of the disease, resulting in a reduction or interruption of arterial blood flow, and causing angina pectoris, myocardial infarction, sudden death and other serious adverse consequences. In addition, long-term smoking will also increase the incidence of lung cancer, colorectal cancer and other tumors. Smoking is harmful to health, and it is recommended to quit smoking immediately regardless of the existence of the disease. Therefore, smoking is absolutely prohibited after coronary artery bypass grafting, and medication and lifestyle adjustments should be made in strict accordance with the physician’s instructions, in order to avoid affecting the results of the surgery and adverse consequences.