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Meanwhile, at the international level, the units of mm and cm are preferred

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Biomarker studies are helpful, but they have limits: Differences in personal smoking behavior Short study durations Differences between cigarette brands Long-term effects are harder to measure

Research Gaps More research is still needed to better understand: How activated carbon filters perform under real-world smoking behavior How quickly saturation happens during normal use Whether reductions in certain chemicals lead to meaningful long-term health changes How these filters perform in non-cigarette uses, such as roll-your-own products Scientific research shows that activated carbon smoking filters can reduce some vapor-phase chemicals, especially certain volatile organic compounds and carbonyl compounds, under laboratory conditions