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Objectives. the main aim of the study was to identify impact of impulsivity on adolescent risk behaviors. Sample and setting. representative research sample consisted of 4,098 high school students of the Czech Republic. the basic set represents 348,678 adolescents, of which approximately 86,796 attend four-year, six-year and eight-year high schools. the research sample consists of approximately 5% of the basic set. Hypothesis. Based on previous findings, research hypothesis predicted impact of impulsivity on abuse of psychoactive substances, bullying and delinquency. Statistical analysis. Linear regression analysis (Enter) was used to determine impact of impulsivity (SIDS) on VRCHA questionnaire variables. Results. Impulsivity is a significant predictor of bullying (R²=0,059), abuse (R²=0,089), and delinquency (R²=0,137) among adolescents. Study limitation. the study operates exclusively with one variable as a predictor of risk behavior. For more complex investigations, other significant predictors need to be induced into the model. [ABSTRACT FROM AUTHOR]