6 Current Status of the Prevalence of Smoking in Nishiarita-Cho Cohort Study and Its Conjunction with Cardiovascular and Cerebrovascular Diseases(Tobacco Free Symposium: The Present Condition of Tobacco Control in Japan, the Risk of Smoking to Cardio-and Cerebro-Vascular Diseases, and Its Counter Measure,Symposium 4 (SY4) (H),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society)