Diabetic patients should never smoke, not even 1 cigarette, and diabetic patients who have the habit of smoking must quit smoking as soon as possible. It is well known that smoking is harmful to the human body, so I will not repeat it here. For diabetic patients, the harm is even greater. First of all, nicotine will stimulate the secretion of adrenaline, which is a hormone that excites sympathetic nerves and raises blood sugar, causing tachycardia, increased blood pressure and blood sugar fluctuations, which is very bad for patients. In addition, the greatest threat to diabetic patients is vascular disease, especially obstructive vascular disease. Diabetic patients often do not smooth the inner wall of the blood vessels, blood viscosity, red blood cell deformation capacity is reduced, it is easy to occur vascular obstruction, smoking will cause further constriction of the blood vessels, especially easy to cause large and small thrombus obstruction of blood vessels. Blocked cerebral vessels is cerebral thrombosis or lacunar cerebral infarction, blocked heart vessels is angina pectoris or myocardial infarction, blocked lower limb vessels is lower limb ischemia or even necrosis, blocked kidney or fundus vessels, will also aggravate diabetic nephropathy or seriously affect vision, with serious consequences. So diabetic patients must not smoke, whether that kind of smoke is so. I have met a smoking diabetic patient, he did not want to quit smoking cigarettes, said: “I would rather die two years earlier, but also to smoke. Even so determined, but also not necessarily as desired, some smoking diabetic patients finally come to a hemiplegia, blindness, uremia, death and can not die, life and can not be born, that is really live to suffer it. Smoking diabetic patients should not experiment with themselves, must quickly quit smoking.