BLACKSBURG, Va., March 10 -- Virginia Polytechnic Institute and State University issued the following news release:

Nearly 50 million people in the United States struggle with substance use disorders, and nearly three in four use more than one substance.

People with polysubstance use disorders are more likely than single drug users to suffer poor health, relapse from treatment, and overdose. They're also three times more likely to die.

The American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders FifthEdition does not acknowledge polysubstance use disorder. The predominant recovery paradigm tells people with multiple substance dependencies that they aren't in recovery until they achieve complete abstinence ...