SEER stage and cancer type were recorded on the basis of cancer registry data and confirmed by self-report of cancer diagnosis in the baseline survey.
Among self-reported diagnoses (n ¼ 2,694), agreement with registry data was high (97.9%), with registry diagnoses used for the remaining cases. Colorectal, bladder, kidney, lung, and mucinous ovarian cancers were classified as smoking-related cancers .
Among the cases of ovarian cancer (n ¼ 121), only 3 were mucinous ovarian. These 3 cases were excluded in analyses of
relationships between smoking-related cancers and smoking behavior.