I disagree that activated carbon would do nothing. It is a fact that activated carbon is one of the most efficient filtering media for many things. Many tests on cigarettes show it does in fact remove nicotine & tar (though not specifically these filters). But I would think as thaidude mentions, it would probably remove some flavour. Also I would think there would be no way to know if the amount of carbon in these filters is enough to be effective. Should make for an interesting thread though!