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Because metabolism, body composition, and product variability differ from person to person, timing alone should not be relied upon as protection

doi: 10.1136/tobaccocontrol-2018-054707 15

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

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