On August 20, 2019 SAMHSA released the latest data findings from the 2018 NSDUH. NSDUH provides estimates of the use of illegal substances, prescription drugs, alcohol, and tobacco, as well as mental disorders, treatment, and co-occurring substance use and mental disorders in the United States. NSDUH data also help to identify the extent of substance use and mental illness among different sub-groups; estimate trends over time; and determine the need for treatment services.