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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吸烟的减少量可明显地反映代偿性吸烟程度，即吸烟量减少越多，代偿越大。

The amount of smoking reduction was shown to be a strong predictor of compensatory smoking, with greater cigarette reduction associated with more compensation.

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一项研究显示，饮食或补品中少量的铁和钙，可能在肺癌形成过程中扮演着重要角色，吸烟者的例子更是明显。

Small amounts of iron and calcium in the diet or in the form of supplements may play an important role in the development of lung cancer, especially among smokers, a study suggests.

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