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There is growing, but inconsistent evidence suggesting oestrogen may play a key role in lung cancer development, especially among never‐smoking women for whom lung cancer risk factors remain largely elusive. Using the China Kadoorie Biobank, a large‐scale prospective cohort with 302 510 women aged 30 to 79 years recruited from 10 regions in China during 2004 to 2008, we assessed the risk of lung cancer...