Smoking and the Risk of Second Primary Lung Cancer Among Breast Cancer Survivors from the Population-Based UK Biobank Study.

However, the association between smoking duration or years since quitting and SPLC risk was marginally significant.

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Breast cancer survivors who received radiation therapy for breast cancer showed a trend for higher SPLC risk, but this association was statistically insignificant (HR 3.78, P = .19; see Table 2 ; Supplemental Table S5 ).

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