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5 years: Risk of cancer of mouth, throat, esophagus and bladder are reduced by half

Here is a table that shows how activity level affects filtration: How the charcoal is put in the filter matters too

[DOI] [PubMed] [Google Scholar] Koivuranta M., Lr E., Snre L., Alahuhta S

Zhao of Delos Labs says

Made in China

Nicotine & Tobacco Research 2003;5:57584
