Purpose: Patients who predominantly used marijuana (natural cannabis) and patients who predominantly used synthetic cannabinoids in their history were evaluated as two separate groups in our study which aimed to compare the sociodemographic characteristics and depressive symptoms of these two groups. Method: The sample of our study consisted of those patients who referred to the Polyclinic of Psychiatry at Ardahan State Hospital and were diagnosed with substance addiction. 30 polyclinic patients who defined predominant use of marijuana and 20 polyclinic patients who defined predominant use of synthetic cannabinoids (bonzai, Jamaika, etc.) (SC) were included in the study. The socio-demographic characteristics of the participants were determined, and the depressive symptoms were assessed by the Beck Depression Inventory. Results: Our study determined the socio-demographic characteristics of the marijuana-using group and the synthetic-cannabinoid-using group as similar. The depression score of the group using synthetic cannabinoids was found to be significantly higher. Discussion: In our study, findings pointing to the fact that cannabinoid use increases depressive symptoms and that synthetic cannabinoids have a strong depressive side effect have been obtained. The cross-sectional characteristic of the study and the low number of subjects constitute the limitations.