Diabetic patients are advised not to smoke. Nicotine in cigarettes will increase the risk of diabetic patients suffering from atherosclerosis, which may lead to narrowing or even occlusion of blood vessel lumen, further increasing the probability of diabetes induced cardiovascular disease, cerebrovascular disease and other serious complications. Moreover, diabetic patients themselves have abnormal glucose metabolism, resulting in the body is very susceptible to a variety of infections, and smoking will reduce the respiratory defense function of diabetic patients, more prone to respiratory infections, such as pneumonia, bronchitis and other diseases. Therefore, diabetic patients are advised not to smoke, so as to avoid a series of complications induced by long-term smoking. Patients diagnosed with diabetes should actively cooperate with the doctor’s treatment to maintain stable blood sugar. When abnormal blood glucose is found, seek medical attention in time.