@kenspence20: There is a strong genetic factor in developing diabetes. Is there a chance you could have it at 45? You'd better believe it. My dad was diagnosed at 33. I was diagnosed at 39.
*But* the complications of diabetes can be greatly minimized and even prevented by getting a handle on your blood glucose levels.
See a doctor, get a complete blood workup and find out where you are, health-wise. Smoking doesn't make diabetes worse, as far as I know, but it isn't good for you, obviously, and if you are diabetic, it's in your best interests to stop smoking.
Getting a handle on your blood sugar now means a longer, healthier life down the road.