AimThis study examined the effects of current and past environmental tobacco smoke exposure on the menstrual cycle and menstrual phase‐related symptoms in nonsmoking Japanese women of child‐bearing age.MethodsOf 5000 women who agreed to participate, 3935 were analyzed (932 smokers, 2326 nonsmokers, and 677 past smokers). Nonsmokers were divided into three groups based on smoking status and environmental tobacco smoke exposure: nonsmokers without exposure (n = 352), nonsmokers with past exposure (n = 1196) and nonsmokers with current exposure (n = 778). Participants completed a questionnaire on background characteristics, environmental tobacco smoke exposure (location and relationship to smokers), abnormal menstrual cycle, days of menstrual cycle and menstrual cycle‐related symptoms experienced in the past 3 months (assessed by the Menstrual Distress Questionnaire).ResultsMean age was 29.7 ± 7.0 (20–44) years. Compared with nonsmokers without environmental tobacco smoke exposure, current smokers had the highest risk of an abnormal menstrual cycle (adjusted odds ratio [OR], 1.74 [1.194–2.545]), followed by nonsmokers with past exposure (adjusted OR, 1.70 [1.171–2.464]), past smokers (adjusted OR, 1.60 [1.081–2.366]) and nonsmokers with current environmental tobacco smoke exposure (adjusted OR, 1.49 [0.901–1.212]). Irrespective of environmental tobacco smoke exposure, current smokers reported significantly more severe premenstrual and menstrual symptoms than nonsmokers, and nonsmokers with past environmental tobacco smoke exposure had significantly more severe premenstrual and menstrual symptoms than nonsmokers without environmental tobacco smoke exposure.ConclusionPast environmental tobacco smoke exposure, especially during childhood or adolescence, might harm women's reproductive health when they reach reproductive age.