Family and environment have besides genetics a great impact on the behavior and life of adolescents. Another great role plays the school environment and the choice of company during this period. These days it is well known that many contents are easily accessible to those young people, which, accompanying general lesser parent involvement in their children’s lives than it used to be in previous generations (both parents working, support of other family members to a lesser extent due to a smaller number and being spread all over, longer journeys and others) influences the tendency to risky forms of behavior. It is therefore important to track trends among the youth, and as far as possible identify risky moments in order to influence such by preventive strategies and measures. In this paper the characteristics and occurrences of risky forms of behavior with students at a medical school for nurses are described, differences in tendencies to risky behavior with regard to smoking, alcohol and drugs and differences in sexual behavior among first grade students and fifth grade students. There have been outlined as well differences between tendencies to risky behavior among students from divorced families, single parents and students of lower socio economic status. 95 first and fifth grade students of the medical school for nurses participated in the research. The results show that 69% of the students smoke every day, 33,9% of them drink at weekends, 30,5% of them mixed drinks. 29,5% of them have tried drugs while 3,6% of them use marihuana on a regular basis. The research results show that there are no significant differences in risky behavior among first and fifth grade students at the medical school for nurses. Nevertheless, the fact that children of single parents smoke less than students with both parents is quite interesting. Before generalizing this data to the general population it is necessary to take the constraints of this research into account. But regardless of them, they give a valuable section of the population which could due to the specificity of the educational curriculum at least partly be considered covered by the preventive strategies in regard of risky behaviors.