The Multiethnic Cohort offers clues in understanding the racial and ethnic differences in cancer incident rates.
The differences were more pronounced at lower levels of smoking, but all of these differences were highly statistically significant. At much higher levels of smoking, these racial and ethnic differences were modest, suggesting some type of saturation level of the carcinogenic effect.
We observed quite striking differences. This suggests there are racial and ethnic differences in the smoking-related risk of lung cancer.