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Tobacco and cancer what are the risks?Get full information about it Tobacco smoke has more than 7000 chemicals, of which many are toxic and cancerous. Worldwide, tobacco use is the single greatest avoidable risk factor for cancer mortality and kills more than How Do Cigarettes Cause Cancer? Memorial Sloan Kettering Cancer Center Smoking BBC Bitesize Smoking is the number one cause of lung cancer. It causes about 90% of lung cancer cases. Tobacco smoke contains many chemicals that are known to cause lung cancer. If you still
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