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. Purpose 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© The Society of Behavioral Medicine 2011.