Women are always less likely to develop heart disease. Women with diabetes are just as likely as men to have a heart attack or stroke. There's no totally certain way to avoid heart disease and circulation problems. But there are lots of things to do to cut your risk. If you smoke, stop.
Nicotine narrows and restricts blood vessels.
So does having diabetes. You can't change having diabetes. But you can stop damage caused by nicotine. Join a stop smoking group. Plan to quit.