Factors associated with postpartum smoking relapse at early postpartum period of Japanese women in the Japan Environmental and Children’s Study oleh Akane Anai, Kaname Asato, Nozomi Tatsuta, Kasumi Sakurai, Chiharu Ota, Shinichi Kuriyama, Junichi Sugawara, Takahiro Arima, Nobuo Yaegashi, Kunihiko Nakai, The Japan Environment and Children’s Study Group