他们发现，在2004年，世界范围内有40%的儿童、33%的不吸烟男性和35%的不吸烟女性暴露于二手烟环境下。

Worldwide, 40 percent of children, 33 percent of non-smoking men and 35 percent non-smoking women were exposed to second-hand smoke in 2004, they found。

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一些尼古丁含量高的人是不吸烟的，根据推测，应该是被动暴露在二手烟环境中所致。

Some of the men with the highest levels of nicotine were non-smokers who, presumably, had been exposed via passive smoking.

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这项调查也发现，有72.4%的非吸烟者暴露在二手烟环境下。

The survey also found that 72.4 percent of nonsmokers reported being exposed to secondhand smoke.

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