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Students sign their names on a huge cigarette model to mark "World No Tobacco Day", which falls on May 31, in Huantan Middle School in Huaibei City, East China's Anhui Province, May 30, 2008. The Chinese characters on the model read "Refuse to smoke the first cigarette." The theme of this year's "World No Tobacco Day" is "Tobacco-free youth".[Asianewsphoto]