Objective: To investigate the current status of smoking behavior among adolescents in Chongqing and associated factors at both individual and school levels, so as to provide scientific evidence for the development of smoking control strategies for adolescents. Methods: From September to October 2021, adolescents tobacco epidemic monitoring was carried out in Chongqing. A total of 9 588 students from 10 monitoring districts and counties in Chongqing were selected to complete the Chinese adolescent tobacco epidemic survey questionnaire by multi stage stratified cluster probability sampling method. Multi level Logistic regression model was used to analyze smoking behavior among adolescents and associated factors. Results: The attempted smoking rate among young people was 17.1%, and the current smoking rate was 3.9% in Chongqing. There was a clustering of smoking behavior among participants the school level. Multi level Logistic regression models showed that general high school, vocational high school, male students, smoking at home, seeing someone smoking in indoor public places, seeing someone smoking at school, smoking among good friends (some smoking, most smoking, all smoking), feeling more comfortable of smoking in social occasions, using electronic cigarette, which were positively correlated with smoking attempts ( OR=1.45, 1.40, 1.91, 1.50, 1.42, 1.43, 2.05, 5.38, 6.53, 1.36 , 5.04, P <0.05). Smoking making people look less attractive and feeling more uncomfortable of smoking in social occasions were negatively correlated with smoking attempts ( OR=0.76, 0.48, P <0.05). Vocational high school, male students, smoking at home, seeing someone smoking in indoor public places, smoking among good friends and using electronic cigarette, which were positively correlated with smoking now ( OR=1.62, 1.67, 1.69, 1.83, 5.84, 23.02, 35.84, 6.28, P <0.05). Feeling more uncomfortable of smoking in social occasions was negatively correlated with current smoking ( OR=0.29, P <0.01). Conclusions There is a cluster of attempted smoking and current smoking behaviors at the school level among adolescents in Chongqing, and the influencing factors include school type, gender, family environment, social factors, etc. It should strengthen the implementation and broaden the scope of smoking control regulations in public places, and promote the healthy growth of young people through social school family cooperation.