本研究以PRECEDE模式探討青少年避免二手菸行為，共有208位不吸菸之15－19歲的南臺灣地區技術學院青少年參與本研究。研究工具為結構式問卷，問卷內容包括：社會人口學資料、避免二手菸行為、二手菸的知識、避免二手菸的態度、避免二手菸的自我效能、學校避免二手菸的健康資源現況、自覺家人執行避免二手菸行為、自覺同儕執行避免二手菸行為、同住家人是否吸菸及同儕是否吸菸等，以不記名方式填寫。研究結果顯示：（1）青少女的避免二手菸行為較青少男好；（2）避免二手菸的態度、避免二手菸的自我效能、自覺家人執行避免二手菸行為、自覺同儕執行避免二手菸行為與避免二手菸行為成正相關；（3）同儕不吸菸者其避免二手菸行為較好；（4）採用階層迴歸分析法發現性別、避免二手菸的態度、自覺同儕執行避免二手菸行為、及自覺家人執行避免二手菸行為為重要的預測因子，可解釋54.5％的青少年避免二手菸行為變異量。本研究結果提供未來提升青少年避免二手菸行為之參考。

This study employed the PRECEDE model to investigate the correlates of behavior to avoid environmental tobacco smoke (ETS) in adolescents. A total of 208 adolescents who were non-smoking and aged between 15 and 19 years old enrolled in junior programs in technical colleges in southern Taiwan were selected as participants. An anonymous questionnaire including demographic data, ETS avoidance scale, knowledge of ETS scale, attitude toward avoiding ETS scale, self-efficacy of avoiding ETS scale, perceptions of health resources for avoiding ETS in school scale, perceptions of ETS avoidance in families, perceptions of ETS avoidance in peers scale, whether the family smoke, and whether close friends smoke were used to collect data. The results showed: (1) behavior to avoid ETS for female adolescents was better than that of male adolescents; (2) attitude toward avoiding ETS, self-efficacy of avoiding ETS, perception of ETS avoidance in families, and perception of ETS avoidance in peers were significantly positive related to behaviors of avoiding ETS; (3) adolescents with close friends not smoking had a better behavior to avoid ETS; and (4) hierarchical regression analysis shows that gender, attitude toward avoiding ETS, perception of ETS avoidance in peers, and perceptions of ETS avoidance in families were the significant predictors, and could explain 54.5% of the total variance in behaviors to avoid ETS. Results of this study can serve as a reference on improving ETS avoidance among adolescents.