The most recentNational Survey of Drug Use and Health showed that approximately18 million adults aged 18 or older in 2021 had a co-occurring mental illness and illicit drug or alcohol use disorder in the prior year.
According to the National Institute on Drug Abuse (NIDA), approximately half of people with a mental illness will develop a co-occurring substance use disorder (SUD) in their lifetimes and vice versa. One of the most common co-occurring combinations isdepression and substance use