In this unit, we discussed the connection between substance use and mental illness. While these co-occurring disorders are frequently seen together, treatment options and an understanding of these issues are more difficult to find. Thinking about what you have learned in this unit about the connection between substance use and mental illness, compose an essay that addresses the questions that are listed below. What are some of the most common types of mental illness? How are the differing theories of the causes and factors of mental illness similar, and how do they differ? Why are co-occurring mental health and substance use issues common? Why are individuals with co-occurring disorders at risk for negative outcomes? Why do you think individuals with co-occurring disorders often do not receive treatment? What changes do you think can be made to help individuals with co-occurring disorders? Your essay must be at least two pages in length and include an introduction, and you must use at least one academic source. Adhere to APA Style when creating citations and references for this assignment. APA formatting, however, is not necessary.