作者为了证明吸烟对青少年肺功能的影响而测定了 10～18岁男女青少年的肺功能并对吸烟习惯进行调查。1　对象与方法1974～ 1979年间对在美国 6个州的 8个城市 1～ 4年级 122 5 3名白人学生 ,每年检查一次 ,直到 9年级。对父母或监护人员进行吸烟习惯问卷调查 ,对学生及父母的呼 In order to prove the effect of smoking on adolescents’ lung function, the authors determined the lung function of adolescents aged 10-18 years and investigated smoking habits. 1 Objects and Methods Between 1974 and 1979, 12535 students from 1st to 4th grades in 8 cities in 6 states of the United States were examined once a year until the 9th grade. Conduct a smoking habit questionnaire survey of parents or guardians and call for students and parents