Smokers who need bypass surgery may have to quit for at least a year before they have a good chance at a successful procedure. Researchers in China looked at the outcomes of more than two hundred elective bypass surgeries. They found heavy smokers had more damaging enzymes in the leg veins used to replace diseased heart arteries. Levels of these enzymes went down after smokers quit, but they still had not returned to normal a year after kicking the habit. It's estimated that more than 350 million people in china smoke.
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