Mẹ hút, con ho
Những thai phụ hút thuốc sẽ khiến con của họ có nguy cơ bị hen suyễn cao gấp 2 lần so với con của những người không hút thuốc. Trong trường hợp các bà mẹ không bị hen suyễn, thói quen hút thuốc của họ vẫn ảnh hưởng xấu lên con cái.
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