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Which word is described as air that has been contaminated by tobacco smoke? A. passive smoke B. secondhand smoke C. mainstream smoke D. sidestream smoke
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Which word is described as air that has been contaminated by tobacco smoke? A. passive smoke B. secondhand smoke C. mainstream smoke D. sidestream smoke

User Dawoon
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4 votes
Passive would be my best guess. 
User Mark Leiber
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2 votes
B.Second-hand smoking this also means the air is being breathed in by another person.
User FKLC
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