cigarette secondhand smoke effects Third-Hand Secondhand Smoke Is a Risk
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Sanchez-Hernandez, J

There may be an even stronger connection, but for now, it is just speculation

Curr Sci

Eur J Cancer 50(5):9971003 Leffondr K, Abrahamowicz M, Siemiatycki J, Rachet B (2002) Modeling smoking history: a comparison of different approaches

Their place is in the dustbin not in your toilet seat
