SUGGESTED ANSWER TO QUESTION 1-3

There are two things we might try to explain here: why Sarah became schizophrenic or why Sarah started using drugs. In fact, you probably concluded that these two events were causally related. Many of you probably developed the following theory: the use of drugs caused Sarah to become schizophrenic. But there is an alternative theory that also is possible: Sarah began having subtle mental problems that were related to her developing schizophrenia (perhaps strange sensations or disturbed thinking) that led her to begin using drugs as a way to self-medicate. While she was using drugs, her schizophrenia developed to the point where it became obvious to others. In this alternative theory, Sarah's drug use was a reaction to her schizophrenia, not a cause of it. There also is a third alternative: Sarah's drug use and her schizophrenia were unrelated. It was merely a coincidence that they both developed around the same time.