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QUITTING IS CONTAGIOUS

Images display social connections of smokers and non-smokers in 1971 (left) and 2001 (right). Yellow nodes represent smokers and green nodes represent non-smokers. Orange arrows denote friendship or marital ties and purple arrows denote family ties. In 1971, many smokers were dispersed throughout interconnected social groups. In 2001, fewer people smoked and those who did were on the fringes of social groups. Credit: J. Fowler

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