Analysis of information sources in references of the Wikipedia article "Smoking" in English language version.
[...]In 2006, an estimated 20.8% (45.3 million) of U.S. adults[...]
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: CS1 maint: archived copy as title (link)[...]In 2006, an estimated 20.8% (45.3 million) of U.S. adults[...]
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: CS1 maint: archived copy as title (link)