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True or false: Smoking causes heart attacks.

Smoking affects your coronary arteries, which supply blood to your heart. Smoking makes them narrower, stiffer and less smooth. This makes it more likely that you will have a heart attack.

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This information is for educational use only, and is not a substitute for prompt professional medical advice. Readers should always consult a physician or other professional for advice and treatment. ©BMJ Publishing Group Limited 2008. All rights reserved.