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So why is smoking bad for you

says Shields

it can leave epigenetic marks on DNA that persist across generations

4 in 1963 bright tobacco processing was concentrated in the Richmond Standard Metropolitan Statistical Area (SMSA), burley tobacco processing in Louisville, and cigar leaf wrapper processing in Pennsylvania Source: Library of Congress, "The national atlas of the United States of America," Tobacco Manufactures Different types of tobacco are grown in different places

"You cant undo the damage that has already been done, but you can avoid causing further damage," said first author Yoonhoo Chang, a graduate student at WashUMed

Smoking tobacco can affect a persons skin and hair