Discrepancies Between Self-Reported Smoking and Carboxyhemoglobin: An Analysis of the Second National Health and Nutrition Survey.

Environmental, self-report, and demographic factors mediated the relationship between self-reported cigarette smoking and carboxyhemoglobin among 2114 smokers and 3918 nonsmokers. Self-reported non-smokers with carboxyhemoglobin levels between 2% and 3% were more likely to be self-reported ex-smokers, to live in a larger community, and to be younger, less educated, and male than were self-reported nonsmokers with carboxy hemoglobin levels of less than 2%. Self-reported non-smokers with strong evidence of cigarette consumption (carboxyhemoglobin level ≥ 3%) were more likely to be self-reported ex-smokers, younger, less educated, and non-White than were nonsmokers with carboxyhemoglobin levels of less than 2%. [ABSTRACT FROM AUTHOR]