title: Relationship between amounts of daily cigarette consumption and abdominal obesity moderated by CYP2A6 genotypes in Chinese male current smokers.
abstract: BACKGROUND
  Cigarette smoking is an important risk factor for abdominal obesity. However, the degree to which the CYP2A6 genotype moderates the relationship between smoking and abdominal obesity has not been established.
  
  
  OBJECTIVE
  This study aims to investigate whether or not the relationship between smoking quantity and abdominal obesity is influenced by CYP2A6 genotypes.
  
  
  METHODS
  Nine hundred fifty-four male current smokers were selected. A venous specimen was collected to test serum cotinine and CYP2A6 genotype, and all smokers were divided into heavy (>15 cigarettes/day) and light smokers (≤15 cigarettes/day).
  
  
  RESULTS
  Heavy smoking increased the risk of abdominal obesity (odds ratio (OR) = 1.57; 95% CI, 1.13-2.19) compared with light smoking. Furthermore, heavy smoking had a positive interactive effect with CYP2A6 poor metabolizer genotype on abdominal obesity (OR = 3.90; 95% CI, 1.25-12.18). Moreover, CYP2A6 poor metabolizer genotypes were associated with slower nicotine metabolism.
  
  
  CONCLUSIONS
  Heavy smoking may increase the risk of abdominal obesity-particularly in smokers with CYP2A6 poor metabolizer genotypes.
authors.affiliation: Department of Biostatistics and Epidemiology, School of Public Health, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Sean P
authors.initials: SP
authors.lastname: David
authors.forename: Rachel F
authors.initials: RF
authors.lastname: Tyndale
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Xue-Qing
authors.initials: XQ
authors.lastname: Yu
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhou
authors.forename: Wei-Qing
authors.initials: WQ
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000235:genetics; D002681:China; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D059647:Gene-Environment Interaction; D056726:Genetic Association Studies; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D056128:Obesity, Abdominal / Q000209:etiology* / Q000235:genetics; D012907:Smoking / Q000009:adverse effects*
chemical_list: C402671:cytochrome P-450 CYP1A6 (fish); D003577:Cytochrome P-450 Enzyme System