As well as being at increased risk of a series of respiratory conditions, the lungs of children who breathe in passive smoke may also develop more slowly than children who grow up in smoke-free homes.

除了对儿童的呼吸道产生一系列的危害外，经常被动吸入香烟的儿童，其肺功能的发育要比无烟家庭孩子的来得慢。

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As well as being at increased risk of a series of respiratory conditions, the lungs of children who breathe in passive smoke may also develop more slowly than children who grow up in smoke-free homes.

BBC: Passive smoking 'kills 600,000' worldwide