A great number of studies have consistently pointed to the association between cannabis abuse and higher rates of psychotic disorders, earlier age of psychosis onset, and an increase in the frequency of relapses. As adolescent cannabis users show a significantly increased risk for psychotic disorders in comparison to nonusers, preventive measures would be particularly important in this age group. In this case report, we will discuss cannabis use as a risk factor for the development of psychotic symptoms and for the potential aggravation of the course of psychotic disorders by providing an illustrative example of a young patient with a religious delusion.