曾吸烟的人或者每天吸烟低于半包的人看起来不处于增加的风险中。

Former smokers, or those who smoked less than half a pack per day, did not appear to be at increased risk.

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将近十分之一母亲称她们在整个孕期内都大量吸烟，另外有12.5%被调查者表示她们在此期间曾少量吸烟，而12.4%的人则称她们在怀孕期间停止吸烟。

Almost one in 10 of the mothers said they smoked heavily throughout their pregnancy; a further 12.5% said they smoked lightly during this period, and 12.4% said they stopped smoking while pregnant.

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