Interactive effects of NAT1 genotype with cigarette smoking (left panel) or dietary BaP intake (right panel) on risk of PC. NS, never smokers; LS, light smokers (≤20 pack-years); HS, heavy smokers (>20 pack-years); high, >52.10 ng/day (60th percentile of controls) of BaP intake; low, ≤52.10 ng/day. Solid bars, NAT1 non*10; open bars, NAT1*10.