The aim of this thesis was to examine the frequency and forms of cannabis consumption among young people in Croatia and Bosnia and Herzegovina through an online questionnaire. The research is part of the project "Cannabis analysis of consumption in the Republic of C roatia and Bosnia and Herzegovina for the development of a program of safer use", which is carried out at the Faculty of Education and Rehabilitation of the University of Zagreb and the Faculty of Philosophy of the University of Mostar, which began on Marc h 1, 2021, and is still ongoing . The questionnaire used in this research was The Instrument Daily Sessions, Frequency, Age of Onset, and Quantity of Cannabis Use Inventory (DAFQ CU), which is the first instrument that includes all the necessary dimension s of cannabis use it measures the frequency of cannabis use, the age of onset of cannabis use and very precisely measures in detail the amounts of cannabis and THC consumed (using images). The questionnaire was filled out by 194 participants (Female = 53 .6%, Male = 6.4%) from Croatia and BiH who had consumed cannabis at least once in their life. The results showed that the age of the first consumption of cannabis in at least half of the respondents was under the age of 18. It was also established that mo st people continue to consume cannabis after the first try and that they do so regardless of whether it is a weekday or a weekend and the most common way of consumption is smoking a joint.