Active and passive smoking and breast cancer in Japan: a pooled analysis of nine population-based cohort studies.
Keiko WadaChisato NagataMai UtadaRitsu SakataTakashi KimuraAkiko TamakoshiYumi SugawaraIchiro TsujiRen SatoNorie SawadaShoichiro TsuganeIsao OzeHidemi ItoTetsuhisa KitamuraYuriko N KoyanagiYingsong LinKeitaro MatsuoSarah K AbeMamami Inouenull nullPublished in: International journal of epidemiology (2024)
Smoking may increase the risk of premenopausal breast cancer, and smoking earlier in life might be especially harmful. The impact of secondhand smoke needs further investigation.