BF, Strokes can be caused by previous neck or head injuries as well. More likely that than what you are quick to speculate about. But then again, you never know...
STROKE RISKS
High blood pressure is the number one reason that you might have a stroke. The risk of stroke is also increased by age, family history of stroke, smoking, diabetes, high cholesterol, and heart disease.
Certain medications promote clot formation and may increase your chances for a stroke. One example is birth control pills, especially if a woman taking them also smokes and is older than 35.
Women have a risk of stroke during pregnancy and the weeks immediately after pregnancy. Overall, however, more men have strokes than women.
Cocaine use, alcohol abuse, head injury, and bleeding disorders increase the risk of bleeding into the brain.
http://www.nlm.nih.gov/medlineplus/ency/ar...0risk%20factors