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Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Smoking The respiratory system in humans WJEC GCSE Biology (Single Science) Revision WJEC BBC Bitesize Effects of smoking on lungs This Is What Happens When You Smoke , Every puff exposes your body to thousands of chemicals, many of which are harmful., Your lungs become damaged over time, Your heart has to work harder, Smoking and its effect on the breathing system Diseases Caused by Cigarette Smoking StoryMD
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