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  1. Health Effects of Cigarette Smoking | CDC

  2. Harms of Cigarette Smoking and Health Benefits of Quitting

  3. Current Cigarette Smoking Among Adults in the United States

  4. Current Cigarette Smoking Among Adults in the United States

  5. Cigarette Smoking: Health Risks and How to Quit - NCI

  6. Health Effects of Smoking | American Lung Association

  7. Smoking: Effects, Risks, Diseases, Quitting & Solutions

  8. Tobacco - World Health Organization (WHO)

  9. Health Risks of Smoking Tobacco | American Cancer Society

  10. Keep Your Air Clear: How Tobacco Can Harm Your Lungs