I'd say it's to set up a clear goal.
Answer:
Either an alcohol or drug use problem or a mental health issue may come first. If you have a mental health issue, you may use alcohol or drugs to try to feel better. Or a substance use problem may lead to mental health symptoms such as depression, anxiety, or rage. For some individuals a substance use problem and mental health issue start at the same time, triggered by the same factor; for others they start separately.
Explanation:
They will start seperatly