The unborn smoker

A large retrospective population-based cohort study from Canada compared pregnancy outcomes in pregnant women who smoked to those who did not. Active smokers had a significantly higher rate of preterm delivery (almost double) and intrauterine fetal demise (almost five times). A dose-response relationship was also noted, with some adverse adverse outcomes increasing with the number of cigarettes smoked daily.

The unborn smoker: association between smoking during pregnancy and adverse perinatal outcomes. Mei-Dan et al, 2014.