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Many public health scholars consider the decline in the prevalence of smoking in the United States during the past 50 years to be a signal accomplishment, perhaps second only to reductions in infant and maternal mortality that were achieved earlier in the 20th century. Although the prevalence of smoking in this country has fallen by nearly half since the 1950s, smoking is still considered the leading cause of preventable death in the developed world. In contrast, the prevalence of obesity has more than doubled in the United States during the past three decades and has also risen markedly in other
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