When we launched this Research Topic dedicated to “Dual Disorders: Mechanisms and Treatment” we were highly ambitious. We wanted to offer the opportunity to colleagues all over the world to use it as a window to show their latest research findings. We were especially eager to read and publish new empirical evidence on the nature of the relationship between addiction and other psychiatric disorders as well as new empirical evidence on the treatment of dual disorders.

Indeed, we already know since several decades, that dual disorders, i.e., the comorbidity between addictive and other psychiatric disorders, are the rule rather than the exception. The high prevalence of dual disorders and their association with worse outcomes, not only related to poor compliance, are already well-documented.....