About 3.4% of adults, or approximately 8.5 million, in the United States have co-occurring mental and substance use disorders (SUDs). This is about 45.5% of adults with SUD, and about 18.2% of adults with any mental illness (AMI). These findings were reported in the "National Survey on Drug Use and Health 2017" by the federal Substance Abuse and Mental Health Services Administration (SAMHSA), and in a presentation given by Assistant Secretary for Mental Health and Substance Use, Elinore F. McCance-Katz, M.D., Ph.D. The report presents the results of a nationally representative survey . . .