The study surveyed more than 18,000 babies born between 2000 and 2002. Their mothers were categorised as either non-smokers during pregnancy, quitters, light smokers or those who smoked more than 10 a day.
The infants' temperaments were assessed at nine months in a range of areas. The results showed children of mothers who quit had the lowest chance of unpredictable behaviour.
The report said: "Persistent heavy smoking in pregnancy is associated with a more difficult temperamental style."
- http://jech.bmj.com.
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