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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

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Photo: Guardian Avionics As mobile devices and other USB-powered technologies have become standards in the cockpit, pilots have had to use larger adapters to convert their cigarette lighters into USB-capable power supplies

But the relatively high risk of Native Hawaiians and the low risk of Latino smokers for lung cancer are not explained by these factors