This study examined the association between women's retrospective repo
rts of smoking during pregnancy and subsequent language, cognitive, be
havioural and physical development in their children up to age 9 years
. While there was a strong association between maternal smoking and an
index of disadvantageous child rearing, maternal smoking was not asso
ciated with more general family disadvantage. After controlling for le
vels of background disadvantage, no relationship was found between rep
orts of smoking and language, cognitive or physical development. Howev
er, smoking was related to maternal reports of behaviour problems at a
ge of school entry. Possible explanations for this relationship are di
scussed.