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CO may be emitted from tobacco smoke and generated from malfunctioning fuel-burning stoves (wood, kerosene, natural gas, propane) and fuel-burning heating systems (wood, oil, natural gas) and from blocked flues connected to these appliances

Jeff Chapman, a pulmonologist at Cleveland Clinic Childrens Hospital, who was not part of the study, agrees

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KWONG: Now, scientists don't know the effect of this intervention long-term

Extracted by Rhian Lubin from Eric Bristow: The Crafty Cockney, Eric Bristow 2008, Published by Century, an imprint of The Random House Group Limited.