Methods A total of 1902 students in 9 middle schools and 2957 parents were investigated by using the questionnaire written by USC China Seven Cities Study.

• 方法采用中国7城市与美国南加州大学合作控制吸烟项目组编制的调查问卷，对杭州市9所中学的学生及其家长进行相关内容调查。