9781422273913

Cigarette smoking causes roughly one in every five deaths in the United States.

WORDS TO UNDERSTAND

emphysema: a condition in which the air sacs in the lungs are severely damaged halitosis: bad breath malleable: able to be molded or changed tolerance: here, when the body adjusts itself to the presence of an addictive substance withdrawal: the negative reactions people experience when a drug they are dependent on is taken away

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