"Many people struggle with both a substance use and a mental disorder. These questions can help you decide whether you need help with substance use, a mental health issue, or both. For people who suffer from both, receiving treatment for both is important for getting better. Treatment works: Recovery starts with understanding that you may have one or both of these problems."
HHS Publication No. SMA10-4585; Health and Human Services Publication No. SMA10-4585
United States. Substance Abuse and Mental Health Services Administration: http://www.samhsa.gov/