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Following publication of this research, the Centers for Disease Control and Prevention in Atlanta warned that even 30 minutes of exposure to other people's smoke might be enough to trigger a fatal heart attack in people at risk of heart disease

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This trend reflects the limitations of Korean e-cigarette regulations, which have been more effective among adolescents with higher SES

Multiple logistic regression analyses Active smoking behavior The multivariate logistic regression analysis identified several factors significantly associated with active smoking behavior (Table 4)