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And How to Prevent It Most people are aware that traditional smoking leaves yellow stains on surfaces over time, the most noticeable effect being the yellowing of teeth

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Traffic signals and signs are an example of a communication system that combines both arbitrary and nonarbitrary elements

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Credit: Jaime Saldarriaga/Alamy via Reuters Reporters: Laura Margottini and Matthew Chapman Impact producer: Paul Eccles Global health editor: Chrissie Giles Global editor: James Ball Editor: Meirion Jones Production editor: Alex Hess Fact checker: Alice Milliken Our reporting on tobacco is part of our Global Health project, which has a number of funders