Smokers and nonsmokers have been found to differ in a gene that influences responses to:
Correct answer: A. dopamine
- A. dopamine
- B. serotonin
- C. acetylcholine
- D. norepinephrine
Explanation
Research has linked differences between smokers and nonsmokers to genes affecting dopamine responses, since nicotine strongly activates the brain's reward pathway. The other neurotransmitters listed are not the standard association in this finding.
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