According to the recent American Chemical Society national meeting clinoptilolite zeolite has been used successfully to filter out carcinogenic polycyclic aromatic hydrocarbons (PAHs) in smoke by as much as 93% while maintaining the flavors.
The zeolite reduced the levels of benzo[a]pyrene, a type of PAH that the International Agency for Research on Cancer classifies as a known human carcinogen, by 93%. Concentrations of several other PAHs also dropped, many by more than 70%
According to the authors of the study, the filtering process actually improves the flavor.
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