Suma Prakash had never smoked a day in her life. A 54-year-old schoolteacher from Kochi, she had breathed the city’s traffic-clogged air for three decades. When a persistent cough began in the winter of 2022, her doctor reassured her — non-smokers rarely get.. Read more: https://www.newindianexpress.com/amp/story/xplore/2026/Jun/22/written-in-blood-a-new-way-to-catchlung-cancer-early