Fig. 2
From: Brain-derived neurotrophic factor gene variants and obesity in former smokers
Association of SNPs with central obesity in former smokers by different smoke exposure before cessation. A: Cigarettes per day [CPD] 0–9 before cessation (left) vs. CPD 10–19 group (middle) vs. heavy smokers (CPD ≥ 20) before cessation (right); B: Heavy Smoking Index (HSI) with 0 score group (left) vs. HSI 1–3 score group (middle) vs. HSI ≥ 4 before cessation (right)