確認青少年吸菸行為的起始及維持該行為的相關因素，是學校護士與公衛護士發展預防青少年吸菸及戒菸計畫上一項很重要的策略。本研究目的為瞭解南台灣青少年吸菸行為的相關因素。本研究以屏東縣高中職生為研究對象，採隨機取樣共4,500人，回收有效問卷為73.5%，共3,307人。本研究之結果，研究對象中有62.4%(n=2,063)過去從未吸菸，而曾吸菸經驗者有38%(n=1,244)，有吸菸經驗者中的59.3%(n=738)已未再吸菸，而仍有40.7%(n=506)保有吸菸的習慣。本研究同時發現，朋友提供菸品、學業成績、父親教育程度、同儕間吸菸行為、原始吸菸的理由、態度及自我效能是預測青少年目前吸菸行為的重要預測因子；而父母親的婚姻狀態及同學有無提供菸則是預測青少年吸菸的重要預測因子。結論：本研究提供學校護士與公衛護士未來在設計菸害防制及戒菸計劃上的重要依據，建議未來的實驗性研究中，可運用本研究結果，進一步評量菸害防制之成效。

Identifying the factors related to the initiation and continuance of smoking among youth has been regarded as a crucial step for school nurses and public health nurses to develop effective smoking prevention and cessation programs in schools and communities. The purpose of this study was to investigate the factors related to adolescent tobacco use in southern Taiwan. A total of 4,500 study samples were selected at random from the students of all high schools located in Pingdong County. This process yielded 3,307 valid samples (a 73.5% response rate). Study results found 62.4% (n 2,063) reported never having smoked before. Thirty-eight percent (n 1,244) of participants had experience using tobacco, 59.3% (n 738) reported being ex-smokers, and 40.7% (n 506) were current smokers. This study found that having friends who offered cigarettes, academic achievement, father's educational level, perceived peer smoking behavior to be primary influences on smoking, attitude, and self-efficacy and significant predicators of adolescents' current smoking behaviors. Parents' marital status and having classmate who offered cigarettes were significant predictors of adolescent smoking behavior. Study findings can provide a basis for school and public health nurses to design effective smoking prevention and cessation programs in schools and community settings. This study suggests further experimental studies are necessary to test the effectiveness of tobacco control programs designed in reference to the findings of this study.