Smoking is an awful habit. However, all heavy smokers would agree that it takes A LOT to make them quit - childbirth, serious health issues, or any other life-changing event.
As someone with diabetes, you already have a pretty serious reason to ditch this smelly, toxic habit. Cigarette smoke damages your heart and blood vessels and may increase your risk for a number of serious complications like kidney disease, nerve damage, and vision problems.
Smokers are also 40% more likely to develop type 2 diabetes than nonsmokers. On top of that, those who have diabetes (no matter which type) are more likely have trouble with controlling their disease and its progression.
If you are currently smoking, quitting would benefit you right away. So, talk to your doctor, consider reading literature on easy ways to quit, or call a helpline to find a method that works for you.
 Campagna D., Alamo A., Di Pino A., Russo C., Calogero A. E, Purrello F., & Polosa R. Smoking and diabetes: dangerous liaisons and confusing relationships.
 American Diabetes Association. Smoking and Diabetes.