According to the text, North Americans of African descent smoke fewer cigarettes per day than Caucasians because those of African descent may be retaining more nicotine per cigarette than Caucasians.

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The text states that "studies have shown that North Americans of African descent may be retaining more nicotine per cigarette than Caucasians, which could explain why they smoke fewer cigarettes per day."

According to the Text, North Americans of African Descent Smoke