A diet high in saturated fats increases a person's risk of developing heart disease. Regular consumption of red wine reduces that risk. Per-capita consumption of saturated fats is currently about the same in France as in the United States, but there is less heart disease there than in the United States because consumption of red wine is higher in France. The difference in regular red-wine consumption has been narrowing, but no similar convergence in heart-disease rates has occurred.Which of the following, if true, most helps to account for the lack of convergence noted above?
【选项】Cigarette smoking, which can also contribute to heart disease, is only slightly more common in France than in the United States.