How Common Are Substance Use Issues at the Same Time as Other Mental Illnesses?

Many people who have a substance use disorder also develop other mental illnesses, just as many people who are diagnosed with mental illness are often diagnosed with a substance use disorder. For example, about half of people who experience a mental illness will also experience a substance use disorder at some point in their lives and vice versa.

https://www.drugabuse.gov/publications/drugfacts/comorbidity-substance-use-disorders-other-mental-illnesses#:~:text=How%20common%20are%20comorbid%20substance%20use%20disorders%20and%20other%20mental%20illnesses%3F