SNPs in the <i>nAChR</i> cluster with cigarettes smoked per day in current smokers, and packyears in ever smokers at the last survey.

Abstract

<p>B = regression coefficient derived from linear regression model, adjusted for age and gender;</p>*<p>only current smokers at the last survey;</p>**<p>ever smokers are current smokers and ex-smokers together.</p><p>a = heterozygote vs. wild-type.</p><p>b = homozygote variant vs. wild-type.</p