RT @mitchelzoler: Avg US cig use halved since 1960 peak, followed by 1/3 drop in annual #LungCancer deaths since 1980 peak #WCLC11
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RT @mitchelzoler: Avg US cig use halved since 1960 peak, followed by 1/3 drop in annual #LungCancer deaths since 1980 peak #WCLC11