他们检测儿童唾液中一种香烟副产物的水平以估测香烟烟雾接触度，并让家长填写一份关于儿童情感、行为和社交问题的调查表。

They measured levels of a byproduct of cigarette fumes in the kids' saliva to gauge smoke exposure and had parents fill out a questionnaire about the kids' emotional, behavioral and social problems.

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对吸收烟雾水平副产品的生物研究发现没有真正的差异。

And biomarker studies on the levels of absorbed smoking by-products find no real differences.

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