Why is smoking linked to a lower risk of Parkinson's?

A link between carbon monoxide and Parkinson's disease may explain why smokers are at lower risk of developing the condition, according to international research. The team monitored the health of 512,701 Chinese adults over 12 years, including 1,131 people with Parkinson's and 2,949 with other neurodegenerative diseases. They investigated the impact of smoking using self-reported smoking frequency and measurements of carbon monoxide in breath—usually an indicator of smoking. The results are published in the journal JAMA Neurology.

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