Change In Second-Hand Smoke Exposure After A Lung And Head And Neck Cancer Diagnosis And Subsequent Patient Smoking Cessation.

9556 Background: Exposure to second-hand smoke (SHS) after a cancer diagnosis is associated with continued smoking in lung and head and neck (HN) cancer patients (PMID: 24419133, 23765604). We evaluated whether complete reduction/cessation of SHS exposure around and after a diagnosis of lung or HN cancer is associated with smoking cessation in the cancer patient. Methods: Lung and HN cancer patients from Princess Margaret Cancer Centre (2006-12) completed questionnaires at diagnosis and follow-up (median 2 years apart) that assessed smoking history and SHS exposures (cohort design). These cancers were chosen because these patients had the highest rates of smoking at the time of diagnosis. Multivariate logistic regression analysis evaluated the association of cessation of SHS exposure after a diagnosis of cancer with subsequent smoking cessation, adjusted for significant covariates. A cross-sectional study (2014) of 90 lung and HNC smoking patients assessed consistency in associations. Results: For the coh...