Are 80% of Strokes Preventable?

Are 80% of Strokes Preventable?
According to an article in the Annals of the New York Academy of Sciences, four out of every five strokes could be prevented if individuals took measures to avoid cigarette smoke, eat a heart-healthy diet, exercise on a regular basis, and better control their blood pressure and cholesterol levels, among other strategies.
Annals of the New York Academy of Sciences, March 2015