cigarettes and skin aging Identical twins Jeanne and Susan show how lifestyle shapes aging. Jeanne avoided Tobacco smoke causes premature skin

Combined, these efforts make smoking less affordable, less visible, less socially acceptable and easier to quit

N Engl J Med (2010) 362(24):2295303

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Dentists screen for these changes at routine exams

They thought they could get away with anything because they were so small, Luft wrote

Genetic variants of CYP2A6 can decrease or inactivate the enzyme, an action that can turn smokers into slow metabolisers of nicotine, says Robert A Schnoll, co-author of the study and associate professor of psychiatry at the University of Pennsylvania School of Medicine