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Additionally, the bimodal size distribution of particles smaller than 2.5 m observed in this study is consistent with previous research, indicating a potential for deeper respiratory PM deposition in both firsthand and secondhand exposures 56,57
E-cigarettes are less harmful than traditional cigarettes, but are still not completely safe
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After screening the titles and reviewing the abstracts, only 21 full-text articles were obtained for comparison that met the inclusion and exclusion criteria
