In 2017-2018, The Australian bureau of statistics, found that one in ten people (10.4%) had depression, or feelings of depression.
It is common to think that your loved one is experiencing depression due to their level of alcohol or drug use, however most commonly, depression is the reason that people are overusing alcohol and drugs. Individual that present at drug and alcohol rehabs are nearly always masking an underlying mental health condition, a phenomena known as self-medicating.
If you or your loved one is experiencing a substance use problem, they are more than likely experiencing a mental health issue and are unaware of it.