Diabetic patients in general should quit smoking to avoid the impact of nicotine in tobacco on their condition. Diabetes mellitus is a chronic metabolic disease caused by insufficient insulin secretion or impaired utilization of insulin. Because the disease can not be completely cured, the continuous development of the disease will affect the patient’s nervous system, cardiovascular system and other functions, some patients with serious conditions will increase the incidence of diseases such as atherosclerosis, myocardial infarction, etc. Cigarettes are common in life. Cigarettes are common tobacco products in our life, and the burning of tobacco produces a large number of harmful substances, such as tar, nicotine and so on. Among them, modern medical research found that nicotine into the human body, will produce excitation of the central nervous system and stimulate the secretion of adrenaline, which will subsequently lead to the human body to appear heart acceleration, vascular constriction, etc., on the cardiovascular system damage is greater. It may increase the incidence of cardiovascular disease in diabetic patients, so diabetic patients should quit smoking. In addition to smoking cessation, diabetic patients should also pay attention to limiting alcohol, while paying attention to low-salt, low-sugar, low-fat diet, and increase exercise. Seek medical attention when abnormal blood glucose levels are detected.