Women who have never smoked but are exposed to smoking in the home for more than 30 years are at an increased risk of developing lung cancer compared with women without this passive smoking exposure, suggest researchers.

The analysis also found that women who smoke are 13 times more likely to develop lung cancer than those who have never smoked, but quitting significantly reduces this risk. The study, published in Annals of Oncology, used data from the Women’s Health Initiative Observational Study cohort to investigate the relationship between active and passive smoking and lung cancer incidence in women.

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