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Estimated excess odds ratios per pack-year for cancers of the larynx, pharynx, and oral cavity within categories of cigarettes/day (square symbol) with 95% confidence intervals. Model 1 was fitted to all data (solid line) and to never and ≥10 cigarettes-per-day smokers (dashed line). Pooled data from the International Head and Neck Cancer Epidemiology (INHANCE) Consortium were limited to never and current cigarette-only smokers.
