Final answer:
There is a substantial relationship between psychological disorders and substance use disorders. Studies suggest high comorbidity rates, indicating the need for integrated treatment approaches.
Step-by-step explanation:
Researchers have found that a significant relationship exists between psychological disorders and substance use disorders. Several studies highlight that individuals with anxiety disorders, such as social anxiety disorder, often have higher rates of alcohol use disorder. The National Institute on Drug Abuse (NIDA) provides insights, suggesting that there is a common comorbidity between substance use disorders and various psychological issues. These findings underscore the complex interactions between mental health and substance use and suggest that treatment approaches need to address both areas concurrently.