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________more frequently develop chronic bronchitis, lung cancer, heart disease, and emphysema than________ .

User Nhahtdh
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2 Answers

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Smokers for the first blank and Nonsmokers for the second blank
User Groch
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I think it's: SMOKERS more frequently develop chronic bronchitis, lung cancer, heart disease, and emphysema than NON-SMOKERS.
User HexInteractive
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