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Background  Cigarette smokers have increased white blood cell (WBC) counts and the activation of tumor necrosis factor (TNF). The effect of smoking on WBC counts and TNF system activity, however, has not been separately investigated yet.    Subjects and Methods  One hundred and forty-two Japanese male subjects with normal glucose tolerance were recruited. They were stratified into two groups based on the questionnaire for smoking: one with current smokers (n = 48) and the other with current non-smokers (n = 94). Whereas no significant differences were observed in age, BMI, high molecular weight (HMW) adiponectin, and TNF-α between the two groups, current smokers had significantly higher soluble TNF receptor 1 (sTNF-R1) (1203 ± 30 vs. 1116 ± 21 pg/ml,  p  = 0.010) and increased WBC counts (7165 ± 242 vs. 5590 ± 163/μl,  p  < 0.001) and lower HDL cholesterol (55 ± 2 vs. 60 ± 1 mg/dl,  p  = 0.031) as compared to current non-smokers. Next, we classified 48 current smokers into two subpopulations: one with heavy smoking (Brinkman index ≥ 600) and the other with light smoking (Brinkman index < 600).    Results  Whereas no significant difference was observed in age, BMI, HMW adiponectin, WBC counts and TNF-α, sTNF-R1 and sTNF-R2 were significantly higher in heavy smoking group (1307 ± 44 vs. 1099 ± 30 pg/ml,  p  < 0.001; 2166 ± 86 vs. 827 ± 62 pg/ml,  p  = 0.005) than in light smoking group, whose sTNF-R1 and sTNF-R2 were similar to non-smokers (sTNF-R1: 1116 ± 15 pg/ml,  p  = 0.718, sTNF-R2; 1901 ± 32 pg/ml,  p  = 0.437). In contrast, WBC counts were significantly increased in heavy (7500 ± 324/μl,  p  < 0.001) or light (6829 ± 352/μl,  p  = 0.001) smoking group as compared to non-smokers (5590 ± 178/μl). There was no significant difference in WBC counts between heavy and light smoking group ( p  = 0.158).    Conclusion  We can hypothesize that light smoking is associated with an increase in WBC counts, while heavy smoking is responsible for TNF activation in Japanese male subjects with normal glucose tolerance.

Smoking, white blood cell counts, and TNF system activity in Japanese male subjects with normal glucose tolerance