What are symptoms of black lung disease?

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  1. #their
  2. #lying
  3. #tolerance
  4. #shortness
  5. #breathe
  6. #inability
  7. #breath
  8. #phlegm
  9. #black
  10. #primary
  11. #other
  12. #common
  13. #exercise
  14. #diseases
  15. #symptoms
  16. #cause
  17. #doctors
  18. #similar
  19. #coughing
  20. #decreased
  21. #cough
  22. #include
  23. #chronic
  24. #miners
  25. #complicated
  26. #diagnosis
  27. #important