Risky behaviour is the basic term for describing the behaviour of youg people who on their way to various problems, encounter a large amount of difficulties which affect their positive development, lead to delinquency and difficult adaptation to surroundings. During that time they encounter various drugs for the first time. Numerous historical facts confirm that addiction to drugs, alcohol and cigarettes is not a new phenomenon but is known to mankind for a long period of time. The first step that leads to addiction is “pure curiosity” which can end tragically. The research was done in Varaždin in first classes of two high schools: “Elekstostrojarska škola” and “Medicinska škola”. A total of 210 examinees were included. The poll was directed towards questions about beginnings, frequencies, reasons for smoking tobacco, doing drugs and consuming alcohol. It also included questions about sex, betting, going out and communication between parents and children. The results have shown that there is a large percentage of young people who smoke tobacco and consume alcohol during weekends. Furthermore, the poll revealed that most young people discuss their problems with their friends, and only afterwards with their parents. In conclusion, addictions are a big problem of our time and it is important to direct the young to the proper path by prevention programs, educations and cooperation with parents and close people.