What is the first sign of lung cancer?

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  1. #breathing
  2. #cancer
  3. #cough
  4. #phlegm
  5. #laughing
  6. #worse
  7. #chest
  8. #coughing
  9. #colored
  10. #common
  11. #symptoms
  12. #blood
  13. #often
  14. #sputum