Women of every age know the threat that breast cancer poses. Girls grow up watching their mothers march against it, and that activism has brought much needed resources and attention to the disease. Yet the cancer that kills more women each year than breast, ovarian and cervical cancers combined is lung cancer. Because it was once mostly a male disease, and because it is associated with smoking, women assume if they never smoked, or if they stopped years ago, they don’t need to be on the lookout for this deadly cancer.

But they do. Two-thirds of lung cancer’s female victims quit at least a decade earlier or never smoked at all.