Smoking behavior is something a person does in the form of burns and smoke tobacco and causes smoke inhaled by people around him. As a result of exposure to secondhand smoke is not only active smokers but also the passive smokers. This is a descriptive study. The research sample is a few students SMA Negeri I Kakas were randomly selected and are willing to respondents. This study used a questionnaire distributed to selected respondents. Conclusion: Picture of student knowledge and attitude towards the dangers of smoking were categorized either. While the action on the dangers of smoking is not considered good. Keywords: Student, The Behavior of The Dangers of Smoking
                        
                        
                        
                        
                            
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