[Cigarette smoking as a risk factor of premature labor].

The effect of cigarette smoking by parents on the incidence of premature labour was analysed. Premature labours accounted for 14.1% of all labours. Cigarette smoking by pregnant women was a significant risk factors for prematurity, it increased significantly hypoxia caused by chemical pollution of the environment and contributed to intrauterine hypotrophy in premature babies. The per cent of smokers among premature babies with normal weight was 37.4%, but among premature babies with the syndrome of intrauterine hypotrophy it was 58.4%. The per cent of heavy smokers was significantly in the group of premature babies, and also the duration of smoking habit by mothers was longer.