Twenty percent of adult survivors of childhood cancer smoke cigarettes regularly, according to a British study published July 30.The prevalence of smoking varied by subgroup in this study of more than 10,000 child cancer survivors. Compared with those who'd had central nervous system neoplasms, study participants who survived Wilms' tumor (odds ratio 2.75), Hodgkin's lymphoma (OR 2.63), soft-tissue sarcoma (OR 2.34), leukemia (OR 2.2), neuroblastoma (OR 2.01), or nonheritable retinoblastoma (OR 2.06)...