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Originally Posted by SMHarman
Filtration of purification - no, extraction yes, however you would need to be standing in a howling gale for it to be fully effective.
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Assuming 'extraction' and 'ventilation' are the same thing, here's another from the same page:
"Changes in ventilation rates during smoking do not have a significant influence on the air concentrations of tobacco components. This means, in effect, that efforts to reduce indoor air pollution through higher ventilation rates in buildings and homes would hardly lead to a measurable improvement of indoor air quality."
http://www.no-smoke.org/document.php?id=268 (Which is the Americans for Nonsmokers Rights website, but this paragraph is based on European Union research: "Joint Research Centre, Indoor air pollution: new EU research reveals higher risks than previously thought. Brussels: European Commission. September 22, 2003.")