Health education has a key role in the preservation of health and disease prevention, especially addictive disorders. Children can be educated about the importance of health through activities that contain health topics, as well as about quality care of their own and others' health, and possible risks and addictions in society. In addition, health education in educational institutions can encourage the prevention of addictive disorders and raise awareness among children of the harmfulness of consuming addictive substances.This Bachelor thesis will explain the meaning, role, goal and aim of health education, its characteristics and classifications. It will also define addictive disorders and most common addictive substances. In addition, the paper will show the prevention and classification of addictive disorders, as well as the representation of health preventive activities in education systems in Croatia. At the end of the paper, the emphasis is on the medical staff, who should be included in public health-related preventive actions, as well as in all stages of preparation and implementation of health education topics into the education system. Unfortunately, this is still insufficiently achieved in everyday life.