According to the research, people with heavy head injuries and the smokers are factors of the dementia, and they have risk much higher than normal person.The risk of the dementia, having head injuries here is four times bigger than normal. And, the smokers are twice times as big as that one.Therefore, everyone remembers to wear a helmet with riding motorcycle, and find smoking cessation outpatient service for assistance.If you do not want get the dementia in your future, please remember that eat well, do exercise, and develop a habit of wearing a helmet.