Secondhand tobacco smoke causes many of the same diseases as direct smoking.

吸入二手烟会导致许多同直接吸烟所产生的一样的疾病。

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Everyone knows smoking is a bad idea. And by now you've probably heard that breathing in someone else's secondhand smoke is also hazardous to your health.

每个人都知道吸烟有害身体健康。想必你现在也知道了，吸别人的二手烟也对自身健康有很大的危害。

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The blood tests are important, because many people underestimate their exposure to secondhand smoke, said Terry Pechacek, associate director for science in the CDC's Office on Smoking and Health.

因为很多人低估了二手烟的危害，所以验血很重要，CDC 吸烟与健康办公室自然科学合作负责人Terry Pechacek 说。

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Full or partial smoking bans would reduce secondhand smoke drifting between apartments, prevent cigarette-related fires, and even help smokers quit, they argue.

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"People really need to stop smoking and stop being around secondhand smoke, " he says.

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The survey results are now informing public debate about smoking regulations and creating awareness about the need to protect residents from secondhand exposure.

FORBES: Second in a series