Orctanian Health

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Inhabitants of the country Orctania suffer from a much lower incidence of cancer than the inhabitants of other countries, for reasons that are generally theorized to be environmental and behavioral--the pollution-free air, stress-free and drug-free living, healthy dietary practices, and active lifestyle. Nevertheless, people from other countries who take up residence in Orctania and attempt to follow the practices of the inhabitants still have a radically higher incidence of cancer than do native Octanians.

Which of the following does NOT help to explain the higher incidence rate of cancer in non-native Orctanians?