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.