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The figure depicts the major established pathways of cancer causation by cigarette smoking: (1) the exposure to carcinogens (cancer-causing substances), (2) the formation of covalent bonds between the carcinogens and DNA (DNA adduct formation), and (3) the resulting accumulation of permanent somatic mutations in critical genes (genes appear in italics)

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Metabolic effects of smokers undergoing smoking cessation

In fact, there was an increase in teenage smoking compared with nearby communities that hadn't cracked down

2019 Apr 30;16(9):1525

[5] Classic Ultra Milds were introduced in 1997 [6] The different brand variants were sold in packages with different colors