[States and predictors of postpartum smoking relapse: a population based longitudinal study].

Objectives　Although more than half of women who smoke attempt to stop smoking after conception, many relapse after delivery. We conducted a population-based longitudinal study to identify the predictors of postpartum smoking relapse.Methods　Participants were expectant mothers living in Nagoya city, Japan, who notified Health Centers of their pregnancy from April 2014 to March 2015.