@Monika - Healthy habits are important. However I would like to point out that not all cerebrovascular diseases are preventable. Like the article said, CV can be causes by tumors, medications, and also come on suddenly in healthy people.
Keeping this in mind I think it's definitely a must for everyone to know what the symptoms of a stroke are. One of my great aunts had a stroke and if she had been to the hospital sooner her prognosis would have been much, much better. Unfortunately the people she was with at the time didn't know what the signs were.