Using carbon or activated charcoal filter tips will filter out a large amount of nicotine and tar, as well as other harmful carcinogens associated with tobacco. Carbon has been known for a long time to be extremely absorbent as it has a high surface area which makes this material extremely reliable for filtration. There are a number of brands on the market from Mascotte to Tune which you can use for as cigarette filters, blunts and pipe filters. Some brands will let you re-use the charcoal filter tips but these are generally purpose built carbon tips such as Tune activated charcoal filter tips, the more regular charcoal tips such as Mascotte can be used only once. With all charcoal filters you will notice a smoother taste as well as a improved taste.