People who smoke have a 30% to 40% increased risk of developing type 2 diabetes. In people who already have diabetes, smoking makes it harder for them to control their blood sugar and also increases the risk of diabetic complications like neuropathy and kidney disease. The combination of smoking and diabetes is an especially dangerous one, because it multiplies the risks of heart disease, heart attack, and stroke.
Medical review: Nathan Cobb, MD, November 06, 2017
Centers for Disease Control. Smoking and Diabetes. Accessed 11/7/2017.