Substance Abuse is defined as defined as overindulgence in or dependence on alcohol or drugs, but is basically a term used synonymously with addiction or substance dependence.

Previous to the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-V), substance abuse and substance dependence were the diagnoses used in regards to addiction. Currently, addiction is diagnosed as a substance use disorder and then specified to be mild, moderate, or severe.

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addiction SUD Substance Use Disorder drug alcohol drugs