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Age-sex-race-adjusted hazard ratios (aHR) and 95% confidence intervals (CI) for all-cause mortality for never-smokers and former smokers who quit smoking over 15 years ago, stratified by quartiles of pack-years (PY) of prior smoking, relative to current smokers. The red dotted line is the line of reference, and the green dotted line intersects the aHR for never-smokers
