Despite awareness of the detrimental effects of smoking, many adolescents initiate or continue to smoke. One possible explanation for smoking 13 the belief that it can control body weight. The objective of this study was to determine the association between Body Mass Index and smoking among Malay adolescents in Kota Bharu, Kelantan. A cross·sectional study was conducted between January to June 2005 among 1364 students selected from ten co»educational government secondary schools in Kota Bharu using stratified multistage cluster sampling. Guided self-administered questionnaire and anthropometric measurement were taken. Data was entered using SPSS 12.0 and analysed using STATA 8.0. The overall prevalence of smoking was 6. 7%. The prevalence of smoking among boys was 13.8% and among girls was 1.1%. There was no association between Body Mass Index and smoking. However, the findings may not be generalized to out-of·school youth and other ethnic groups in this country. The study was not conducted anonymously and the use of questionnaire to report smoking status can lead to measurement bias. Strategies aimed at correcting the belief that smoking can reduce weight should be included as one of the components in the prevention of smoking.