Aim Of Work: Evaluation of knowledge to the subject of legal highs and popularity of their use amongst secondary-school students from the Silesian Voivodeship.
Material And Methods: Studies were conducted in spring of 2016 in two randomly selected secondary schools in Katowice and Dąbrowa Górnicza. The survey was carried out amongst students of these schools and concerned question about the knowledge of legal highs effect on the body and their use by young people.