An individual with which genetic predisposition is LEAST likely to continue smoking if they try it?
A. a person who lacks the DRD2 gene
B. a person with the fast-metabolizing genetic variant of the CYP2A6 enzyme
C. Genetic variations play no role in nicotine addiction risk.
D. a person with the slow-metabolizing genetic variant of the CYP2A6 enzyme
Answer: D
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