Patients with diabetes are advised to quit smoking. Because the ingredients in tobacco are very damaging to the patient’s blood vessels, diabetes itself, because of long-term elevated blood sugar, will make the patient’s blood vessels become prone to abnormalities, such as the formation of hardening of the blood vessels or plaque, and smoking can accelerate this process. That is, diabetic patients are prone to vascular complications, and if they also have the habit of smoking, it may make the vascular complications appear more rapidly. There are many diabetic patients who smoke for a long time, and the damage to the blood vessels of the lower extremities is very serious, and this vascular damage appears very early and is more severe. Once the vascular lesions of the lower extremities appear, they are generally based on the narrowing or occlusion of the blood vessels, and the treatment effect is relatively poor, so diabetic patients try not to smoke.