This study investigates the effects of Cigarette and Liquor Consumption and Dietary Habits and sociodemographic variables on medical expenditure for People in Taiwan. Data from the "Cardiovascular Disease Risk Factors two Township Study" project and NHI are used for the empirical analysis. The results show that if a patient with smoking or drinking habit can give up smoking or drinking, the costs of medical services would decrease NT $1, 506 and NT$3, 016 every year, respectively. If a patient can ameliorate dietary habits from refuse nothing type to normal diet type, absorb tonic type and low calorie type then his or her costs of medical services would decrease NT $2, 586, NT $269 and NT$2, 659 every year, respectively. [ABSTRACT FROM AUTHOR]