How many cigarettes a day is OK?

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  1. #dying
  2. #health
  3. #determine
  4. #consequences
  5. #cause
  6. #prospective
  7. #specified
  8. #diseases
  9. #reported
  10. #related
  11. #women
  12. #fewer
  13. #smoking
  14. #cigarettes
  15. #studies