Read "Comorbidity of Mental Disorders and Substance Use" Chapter 4 (from 4.1.1 to 4.1.3, inclusive) to learn more about mental health comorbidities with tobacco use. Also read all of Chapter 5, which covers depression as a comorbidity with various psychoactive substances, and Chapter 7, which covers psychosis comorbidity with psychoactive substances. All the other chapters are supplementary and you may refer to them as needed (for example, if you wish to learn more about personality disorders or other mental health comorbidities).