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More than 500 trillion molecules of strong carcinogens per cigarette: use in product labelling?
  1. Stephen S Hecht
  1. Correspondence to Stephen S Hecht, Masonic Cancer Center, University of Minnesota, MMC 806, 420 Delaware St SE, Minneapolis, MN 55455, USA; hecht002{at}umn.edu

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Cigarette smoke contains 72 carcinogens with ‘sufficient evidence for carcinogenicity’ in either laboratory animals or humans.1 2 The amounts of these carcinogens are almost universally expressed as nanograms or micrograms per cigarette, thus conveying the image of very small quantities (one-billionth or one-millionth of a gram, respectively, where 1 g is 1/454th …

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