1) significant positive correlation between cigarette tax rates and cigarette price, sale volumes of imported cigarettes, cigarette tax revenues, predicted number of smokers, predicted cigarette price, predicted sale volumes of imported cigarettes, and predicted cigarette tax revenues (p < 0.001). 2) significant negative correlation between cigarette tax rates and total sale volumes of cigarettes (p < 0.009), predicted total sale volumes of cigarettes, and predicted sale volumes of cigarettes produced by Thailand Tobacco Monopoly (p < 0.001).