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This leaves room for continued use, including so-called eco filters, and does not mandate a total phase-out
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The truth is much simpler the tip turns dark because of the change in the acidity of the filter when exposed to cigarette smoke
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Graphs were plotted using GraphPad Software (GraphPad, San Diego, CA.), and significance was obtained using a one-way analysis of variance (ANOVA) followed by Dunnetts post hoc test in which treated groups were compared to the lowest concentration
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