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"The findings from this study indicate that among individuals with a mood disorder at baseline who use drugs to self-medicate their symptoms, the odds of developing a new-onset drug use disorder within the next 3 years increased up to 7-fold, relative to those with mood disorders who do not self-medicate."
"The positive relationship between unmet need and illicit drug use and the negative relationship between mental health care use and heavy alcohol use among those without substance dependency is consistent with the behavior predicted under the self-medication hypothesis and suggests that mental health treatment may prevent the development of substance-use disorders."