I need an explanation for this Psychology question to help me study.

Consider the problem of substance use in America. In 1,250-1,500 words, do the following:

1. Define substance use in your own words.
2. Discuss why Americans seemingly have such a desire for illegal narcotics.
3. Explain how treatment for substance use would be different if it was considered a disease versus a choice or behavior change.
4. Examine if the theories of psychopathology adequately explain substance use.

Provide three to five peer-reviewed sources to support your claims.
Prepare this assignment according to the guidelines found in the APA Style Guide, located in the Student Success Center. An abstract is not required.