I think it's pretty common for addicts to have other mental issues. You'd kinda have to be a little mental to use drugs in the first place. We've all been brought up to know that drugs are bad and just say no; so what other than something psychological would make a person take such a risk. My exagf has OCD, depression, anxiety and bipolar disorder. Needless to say that her psychiatrist from her out-patient program has prescribed her a lot of psych meds. and should she stop taking them I have no doubt that she would go back to using.