The purpose of this study was to investigate the relationship between mental illness and socioeconomic factors such as education, age and gender among drug users. Descriptive and ANOVA analysis were performed to 68 structured interviews (Addiction Severity Index basic). Analysis addressed associations between drug usage and level of education, age and gender. Results showed gender differences in self-rated mental health with women drug users rating their mental health lower than men. In addition, there was no association between age, educational level and self-rated mental health. Further studies are warranted to investigate mental health among drug users.