Data of the above outcomes will be collected through telephone interviews (follow-ups) by the investigators. Descriptive statistics will be used to measure the (1) basic info of the participants, including the total number of employees and smoking employees; (2) knowledge on smoking of employers/managerial staff; (3) attitudes on smoking cessation of employers/managerial staff; (4) practices of the corporations with respect to smoking cessation. Logistic regression, linear regression and spearman correlation coefficient will be used to examine the relationships between corporates' policy in smoking cessation and the knowledge and attitudes of employers/ managerial staff. Chi square and t-test will also be used to compare the quit rates between groups and logistic regression will be used to predict quitting. Data will be entered and analyzed using IBM SPSS version 23.