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10. What is the main reason smoking damages the lungs? A) Inhaled smoke increases oxygen B) Nicotine strengthens lung muscles C) Tar and smoke damage alveolar walls D) Carbon monoxide helps oxygen Smoking The respiratory system in humans WJEC GCSE Biology (Single Science) Revision WJEC BBC Bitesize What does a cigarette made up of?? Key Stage 3 Science: Student Book 1 by Collins Issuu
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