Substance use disorder (SUD) is a treatable mental disorder that affects a person's brain and behavior, leading to their inability to control their use of substances like legal or illegal drugs, alcohol, or medications. Symptoms can be moderate to severe, with addiction being the most severe form of SUD.
https://americanaddictioncenters.org/rehab-guide/addiction-disability

https://www.nimh.nih.gov › topics
Substance Use and Co-Occurring Mental Disorders