Meta-analysis and imputation refines the association of 15q25 with smoking quantity

Jonathan Marchini and colleagues with the Ox-GSK consortium report a meta-analysis for smoking phenotypes from 20 studies including 41,150 individuals, confirming an association at the CHRNA5–CHRNA3 locus on 15q25 to smoking quantity. They use imputation based on 1,000 Genomes Project Pilot 1 data to refine the association at this locus.