Lower levels of vitamin C and carotenes in plasma of cigarette smokers.

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Abstract
Plasma levels of vitamins A, C, and E, selenium, and carotenes were determined in 125 male cigarette smokers and 125 age- and race-matched nonsmokers. The smokers had a mean daily consumption of 30.6 cigarettes and a cumulative consumption of 22.8 pack years. Plasma levels of vitamin C and total carotenes were significantly (p less than 0.05) lower in smokers than those of nonsmokers, while levels of vitamin A, selenium, and vitamin E were not significantly different between these two groups. Similar results were found when only those subjects not taking any form of dietary supplements were included for analysis. Except for negative correlation between vitamin A and pack-year, no significant correlates were observed between plasma levels of these micronutrients and indices of smoking status or cigarette consumption in smokers. These data suggest that chronic cigarette smoking is associated with depressed levels of plasma vitamin C and carotenes; however, the relationship between smoking and these plasma micronutrients is still unclear.