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Environmental conditions such as humidity, the efficiency of the urban cleaning system in reducing the resistance of littered filters, the difference in the quality of the filter and tobacco, and the difference in smoking behaviors were effective in this variation

This combination of features ensures an air purifier's efficiency at removing smoke and improving indoor air quality

1 2 Case studies for regulatory approaches to tobacco products: Menthol in tobacco products (Report)

The paucity of evidence regarding their potential detrimental effects to both oral health and systemic health makes these questions difficult to answer