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Smokers Have Lower Parkinson's Risk. Scientists May Know Why

Several studies found a consistent inverse relationship between cigarette smoking and the risk of developing Parkinson’s disease.

  • Smokers have 30-40% lower Parkinson's disease risk compared to non-smokers.
  • Carbon monoxide in cigarette smoke may protect dopamine-producing brain cells.
  • High carbon monoxide levels linked to 30% lower Parkinson's risk in study.
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