Awareness of the Harms of Continued Smoking Among Cancer Survivors.

Background: Smoking cessation is an integral part of cancer survivorship. To help improve survivorship education, clinicians need an understanding of patient awareness of the harms of continued smoking.

Methods: Cancer survivors from Princess Margaret Cancer Centre (Toronto, ON) were surveyed on their awareness of the harms of continued smoking on cancer-related outcomes. Multivariable logistic regression models assessed factors associated with awareness and whether awareness was associated with subsequent cessation among smokers at diagnosis.

Results: Among 1118 patients, 23% were current smokers pre-diagnosis and 54% subsequently quit; 25% had lung and 30% head and neck cancers. Many patients reported being unaware that continued smoking results in greater cancer surgical complications (53%), increased radiation side effects (62%), decreased quality of life during chemotherapy (51%), decreased chemotherapy or radiation efficacy (57%), increased risk of death (40%), and increased development of second primaries (38%). Being a current smoker was associated with greater lack of awareness of some of these smoking harms (aORs = 1.53-2.20, P < 0.001-0.02), as was exposure to any second-hand smoke (aORs = 1.45-1.53, P = 0.006-0.04) and being diagnosed with early stage cancer (aORs = 1.38-2.31, P < 0.001-0.06). Among current smokers, those with fewer pack-years, being treated for cure, or had a non-tobacco-related cancer were more likely unaware. Awareness that continued tobacco use worsen quality of life after chemotherapy was associated with subsequent cessation (aOR = 2.26, P = 0.006).

Conclusions: Many cancer survivors are unaware that continued smoking can negatively impact cancer-related outcomes. The impact of educating patients about the potential harms of continued smoking when discussing treatment plans should be further evaluated.