Alcohol, nicotine, caffeine, and mental disorders

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3181622/

2. Briefly explain the substance abuse related phenomenon, theory, process, issue, or research finding described in Item 1.
3. Explain why the phenomenon, theory, process, issue, or research finding applies to the article and evaluate how well it fits.
4. Extra points for citing peer reviewed or scholarly sources of information (Possible 5 Points).

No Reference page needed.