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For decades,a collaborative effort by the official and public welfare organizations has been made to alleviate the impact of tobacco consumption on public health.Nevertheless,statistical data shows that approximate 20% of the populations are current-smokers in Taiwan.Exposure to environmental tobacco smoke,mainly the sidestream tobacco smoke,is still a concern in public health.To alleviate the exposure to sidestream smoke and the corresponding health subsequences,a novel power-free astray driven by thermal convention was developed to control the pollutants emitted from the burning cigarette tips.