[Cigarette smoking in pregnancy: observational prospective study in three towns of Tuscany Region (Central Italy)].

Objective: to assess the prevalence of smoking in pregnancy and its changes after childbirth, and the characteristics associated with a greater likelihood of smoking during pregnancy in a sample of women attending three university hospitals in Tuscany (Central Italy).

Design: observational prospective multicentric study.

Setting And Participants: 1,036 women in ninth month of pregnancy were enrolled at the teaching hospitals of Careggi (Firenze), Pisa and Siena.