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Smokers have a lower risk of Parkinson's disease. No one knows why
Science
Medicine

Smokers have a lower risk of Parkinson's disease. No one knows why

ZAP Notícias13 September 2026 at 11:20

Smokers have a lower risk of developing Parkinson's disease, a phenomenon that scientists have been trying to explain for some time. For years, it was thought that nicotine could be responsible for this protective effect, but a new study contradicts this theory and points to another substance.

The research suggests that carbon monoxide, a toxic and deadly gas present in cigarette smoke, may be the missing piece to explain this relationship. According to Clara Bueno Lopez, first author of the study and cited by IFLScience, carbon monoxide is known to "protect against oxidative damage and reduce inflammation," properties that could contribute to reducing the risk of Parkinson's.

The study may pave the way for new treatments for Parkinson's disease, although the research is still in its early stages. Researchers warn that smoking still poses serious health risks, so the discovery should not be interpreted as an incentive to smoke.

Why this matters

This discovery challenges the common assumption that nicotine provides protection and suggests a new therapeutic avenue for the treatment of Parkinson's. Patients and families affected by this neurodegenerative disease in Portugal may benefit from future treatments based on this carbon monoxide mechanism.

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