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Then he lights it, and lets the chamber fill with smoke, where an anesthetized rat is exposed to the smoke.So far, Springer and his colleagues have published research demonstrating that secondhand smoke makes it harder for the rats' arteries to expand and allow a healthy flow of blood.With tobacco products, this effect lasts about 30 minutes, and then the arteries recover their normal function

Although the study may be lacking in some areas, those who are following the effects may still be concerned

Richmond-based Altria Group Inc., parent company of the nation's largest cigarette maker, Philip Morris USA, which makes top-selling Marlboros, is not a part of the lawsuit

"Abstinent Smokers' Nicotinic Receptors Take More Than a Month to Normalize"