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Why are cigarettes harmful?

Frank T. Leone, MD
Pulmonary Disease

There are over 4,000 chemicals in just one cigarette:

  • 400 are known to be toxic
  • 40 are known to cause cancer

These chemicals include arsenic, cyanide and formaldehyde. Some of the chemicals found in cigarettes are the same ingredients found in insecticides, toilet-bowl cleaners, mothballs and nail polish remover.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.