Effect of smoking on the risk of gastrointestinal cancer after cholecystectomy: A national population-based cohort study

Figure 2 Risk of colorectal and gastric cancer according to smoking status and quantity in cholecystectomy patients. The hazard ratios were adjusted for age, sex, alcohol consumption, regular physical activity, hypertension, diabetes mellitus, dyslipidemia, body mass index and estimated glomerular filtration rate. A: Colorectal cancer (CRC) risk after cholecystectomy according to smoking status; B: CRC risk after cholecystectomy according to smoking quantity; C: Gastric cancer (GC) risk after cholecystectomy according to smoking status; D: GC risk after cholecystectomy according to smoking quantity. HR: Hazard ratio.