Secondhand smoke exposure in childhood raises the risk for breast cancer
Gram IT, Wiik AB, Lund E, et al. Never-smokers and the fraction of breast cancer attributable to second-hand smoke from parents during childhood: the Norwegian Women and Cancer Study 1991–2018. International Journal of Epidemiology, dyab153. 1 Aug 2021.
https://academic.oup.com/ije/advance-article/doi/10.1093/ije/dyab153/6333578?rss=1
“We followed 45 923 never-smoking women, aged 34–70 years, who completed a baseline questionnaire between 1991 and 2007 through linkages to national registries through December 2018…. During a mean follow-up of 19.8 (6.8) years, 2185 women developed invasive breast cancer, confirmed by histology. Women exposed to SHS from parents during childhood had an 11% higher (95% CI: 1.02–1.22) risk of breast cancer compared with those who were not.”
Stephen Hamann
