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The CDC says it's investigating 94 cases in 14 states

Past studies investigated various pollutants including heavy metals 18 , PAHs 16 , toxins, and nicotine in cigarette filters 19,20,21

Mostly its to keep the humidity down, but, depending on who lives in the house, the bathroom also can be a source of a lot of volatile organic compounds (VOCs)

Second, the sample was limited to adults who smoke cigarettes daily, rather than more inclusive definitions of those who smoke non-daily, which may partially contribute to discrepancies in our findings against the broader literature from other national surveys

The not-surprising conclusion