Give up smoking, or if that is not possible, make sure that your loved ones are far away from third-hand smoke.

戒烟，如果不可能的话，确保你所爱的人远离三手烟。

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Third-hand smoke: What are the dangers to nonsmokers?

三手烟会对不吸烟者构成哪些危害？

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But far fewer of those surveyed were aware of the risks of third-hand smoke.

但受访者中却很少有人知道三手烟的危害。

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The researchers did a study of adult beliefs about the possibility of health risks to children from third-hand smoke.

VOA: special.2009.01.07

But now researchers led by Doctor Jonathan Winickoff at MassGeneral Hospital for Children in Boston are warning about what they call "third-hand smoke."

VOA: special.2009.01.07

"It certainly looks like, they thought this was third-hand information, " said FBI historian John Fox.

CNN: FBI's 'flying saucers' online memo intrigues public

The company heard it third-hand from a Canadian market analyst.

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They found that while 95% of non-smokers and 85% of smokers agreed that direct inhalation of second-hand smoke was harmful to children, just 65% of non-smokers, and 43% of smokers believed the same for "third-hand" smoke.

BBC: Warning over 'third-hand smoke'