Lung cancer is often linked to smoking, yet cases in people who have never smoked demonstrate that other factors can contribute to the disease. In Singapore, lung cancer is the third most common cancer in both males and females. During the five‑year period from 2014 to 2018, lung cancer accounted for 14 % of all cancer incidences in men and 7.5 % in women. It was also a leading cause of cancer mortality, accounting for 26.4 % of cancer deaths in men and 15.7 % in women during the same period. A recent lung cancer screening study led by the National Cancer Centre Singapore (NCCS) detected early‑stage tumours in nine participants who were all non‑smokers, highlighting that lung cancer can occur even in the absence of a smoking history. Understanding the varied causes of lung cancer in non‑smokers is important for awareness, prevention, and early detection. This blog explores five surprising ways non‑smokers can still develop lung cancer and explains why recognising these risk factors matters for health and financial planning....