Nele Sauer

1 Introduction Substance use disorder (SUD) is one of the most prevalent mental disorders with detrimental effects on individuals' physical health, mental well-being and quality of life. It is linked to chronic diseases, impaired cognition and disruptions in personal and occupational functioning [1]. However, not all substance users develop SUD, defined by characteristic substance-related problems such as loss of control or neglecting social roles [2].