In clinical work, we often encounter patients’ families telling us very anxiously, “Doctor, tell us about him, is he not allowed to smoke and drink.” Smoking, as we all know, will not only seriously endanger the health of smokers, but passive smokers also suffer from it. Smoking not only leads to higher tumor incidence, but also has the following hazards, such as: elevated blood sugar, increased heart rate, reduced oxygen supply to the body, leading to narrowing of blood vessels in the upper and lower extremities, dyslipidemia, etc. Diabetic patients with poor long-term blood sugar control are prone to a variety of complications caused by narrowing of blood vessels, and if they smoke again, it is like adding insult to injury and will greatly increase the chance of complications. Therefore, smoking cessation is advocated, and it is even more important for diabetic patients to quit smoking. Alcohol consumption is not advocated because it has the following disadvantages: (1) drinking alcohol on an empty stomach can trigger hypoglycemia; (2) alcohol can affect the effect of insulin and oral hypoglycemic drugs, making blood sugar control unstable; (3) drinking alcohol will provide extra calories without the nutrients of food. Therefore, alcohol consumption is not advocated for diabetic patients. However, in order to have a higher quality of life, it is okay to drink if you must, but it should be done under the following conditions: (1) good glycemic control; (2) good lipid control; (3) appropriate calorie provision and no restriction is needed. If you drink alcohol, it should be in moderation, avoiding sweet and strong wine to avoid hypoglycemia.