Figure 3.

The probability of former smoker status over time by SNP genotype for CHRNA5 SNP rs16969968 and CHRNA3 SNP rs578776.

Controlling for year, age, smoking intensity (<5 or ≥5 cigarettes per day), early initiation of smoking (NHS = <16 years of age, NHS-2 = <15 years of age), menopausal status, use of hormone replacement therapy, body mass index. The odds ratios of smoking cessation between genotypes are consistent over time; however, participants of all genotypes have higher probability of being a former smoker at later timepoints.