A study has found a positive correlation between smoking cigarettes and schizophrenia. What is a possible explanation for this finding?
a. Emotional problems experienced during childhood cause schizophrenia.
b. Some property of nicotine could be part of the cause of schizophrenia.
c. The gene that carries schizophrenia also increases the potential for smoking.
d. A fourth variable could be causing both.
Answer: b.
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