The conceptualization of heroin addiction as a chronic and relapsing state is corroborated by numerous studies, which also point to the differences in individual addiction and treatment trajectories of people who are being treated for heroin addiction. Predicting the outcome and course of treatment has proved to be quite difficult due to a large number of contextual and situational factors that play a role in this process. Aim of this research was to gain insight into treatment of heroin addiction from the perspective of younger adults. This study was conducted on a criterion sample. Six males aged 24-34 participated in research, all of which are included in outpatient heroin addiction treatment within the public health system, and data were collected by semi-structured interview. The results indicate that the process of recovery from heroin addiction is a subjective and dynamic process of personal change, the results of which depend strongly on personal and environmental resources available when facing challenges in the treatment process. The experiences of participants show that despite the key role that availability of adequate professional support in the community has in initiating the recovery process, a large part of that process takes place outside of the treatment environment, within the intrapsychic world of the individual and their immediate environment. It is therefore necessary to direct treatment interventions towards these levels as well.