Patients who had smoked just before the onset of a heart attack had bigger blood clots in their coronary arteries than those who hadn't smoked. These are the results of a study conducted by a team headed by Murray A Mittleman, director of cardiovascular epidemiology at Beth Israel Deaconess Hospital in Boston, USA. "Now we know that there is an increase in short-term risk with each cigarette smoked,'' said Mittleman. Blood clots were found significantly larger in patients who had smoked recently. Smoking causes blood vessels to constrict and stimulate platelets, the blood cells that form clots, Mittleman is reported saying in San Antonio Express News report , published in the US.
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