The role of social exposure to smoking on smoking cessation in adult cancer survivors.

9536 Background: We previously described a strong inverse relationship between social smoking exposures (at home, spousal and with peers) and smoking cessation in lung cancer, with adjusted odds ratios (aOR) of 3-8 (Eng et al, ASCO 2012, abst 9032). In the current analysis, we evaluated whether these associations hold true in adult cancers in general, particularly cancers not traditionally known to have smoking as a risk factor. Methods: 616 cancer survivors across multiple cancer sites were surveyed on their smoking, alcohol, and physical activity habits before and at various times after cancer diagnosis. Social smoking exposures were documented. Multivariate logistic regression models evaluated the association of each variable with change in each habit after diagnosis adjusted for significant socio-demographic and clinico-pathological covariates. Results: Median follow-up after diagnosis was 26 months. 15% had breast cancers; 15% gastrointestinal; 20% genitourinary-gynecological; 24% haematological; 36%...