For example, men with 20-39 pack-years of smoking at baseline demonstrated an elevated risk with marginal significance (HR2 1.43, 95% CI: 0.98-2.10) but the HR was lower in men with more cumulative consumption.
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Smoking and colorectal cancer in a non-Western population: a prospective cohort study in Japan.
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In addition, we did not find a decreasing trend in risk with increasing years after smoking cessation.