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Differences include: The amount of carbon used The size and shape of the carbon granules The length of the filter Airflow design (how tight or open the draw is) Extra materials used with the carbon A filter with more carbon and a better design may trap more of certain compounds than a small filter with less carbon

Some nicotine is attached to smoke particles

Some studies, however, have found that labels are not a deterrent for people who have a high nicotine dependence

However, at that time, the relationship between the amount of specific grain sizes of activated charcoal and the level of p-BSQ in the smoke was not known