Smoking damages the lining of your arteries. Some particles in smoke seem to help 'bad' cholesterol in the blood stick to blood vessels. This leads to a build up of fatty material, known as atheroma, which makes the arteries narrower. Narrowing of the arteries can lead to angina, a heart attack, or stroke.The risk of a heart attack or stroke is also increased because the blood of a smoker is more likely to clot.
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