Smoking behavior of school-age children is a phenomenon that is easily found in various regions in Indonesia. Smoking behavior in school-age children is not only uncomfortable to look at but also has the potential to trigger an increase in health problems caused by smoking behavior. Several factors that influence smoking behavior in school-age children are the environment and smoking behavior of family members This study uses an analytical research design with a cross sectional approach. The sample in this study was some school-age children (class V and grade VI) in Mangelo Village, Mojokerto Regency who met the research criteria as many as 51 respondents who were taken using purposive sampling technique. The independent variables in this study were the environment and smoking habits of family members. The dependent variable in this study was the smoking habit of school-age children. The research instrument used in this study was a modified questionnaire sheet using a google form to implement health protocols during the covid-19 pandemic. In order to determine the relationship between the environment and smoking behavior of family members on the smoking habits of school-age children in Mangelo Village, Mojokerto Regency, the chi square test was used with a significance of : 0.05 There is a relationship between the environment and smoking habits of school-age children in Mangelo Village, Mojokerto Regency with a sig (2-tailed) value of 0.003 < (0.05) and there is a relationship between family members' smoking behavior on the smoking habits of school-age children in Mangelo Village, Mojokerto Regency with sig (2-tailed) value of 0.020 < (0.05) Parental attention which is manifested in the form of good parenting for school-age children will provide positive support to school-age children in dealing with any negative influences such as smoking behavior.