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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The Office on Smoking and Health at the Centers for Disease Control and Prevention (CDC) counted 45.3 million American smokers, using the NHIS (available here).

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