There is a 33% increase in perinatal (after 20 weeks gestation) and neonatal (in the first 28 days of age) mortality in smoking women.
This increase occurs independently of the decrease in birth weight. While the mean length of gestation is only slightly shorter in pregnant smokers, the proportion of preterm births (less than 37 weeks gestation) increases significantly.
Analysis of the Ontario Perinatal determined that maternal smoking increases the perinatal death risk for mothers smok- ing less than one pack per day 20% and 35% for those mothers smoking more than one pack per day. Little further information exists on the other specific causes for increased perinatal mortality.
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