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Cotinine is a chemical that is made by the body from nicotine, which is found in cigarette smoke

One study found that 50 percent of subjects remembered the text-only warning label, while 83 percent correctly recalled the label that contained a graphic image, so it is a more effective advertising strategy to incorporate pictures on labels because the message will then be more memorable

In a large meta-analysis published in the National Library of Medicine , researchers reviewed 32 observational studies involving nearly 4 million participants and more than 35,000 clotting events

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