Descoperire surprinzătoare despre boala Parkinson. Ce ar putea explica riscul mai redus observat la fumători

A long-observed association intrigues researchers: smokers have a lower risk of developing Parkinson's disease compared to non-smokers. A new study suggests carbon monoxide levels may play a role, but experts caution that this does not mean smoking is protective. Researchers from the UK and China analyzed exhaled carbon monoxide levels and Parkinson's risk in over 500,000 participants. Those with higher carbon monoxide levels showed a reduced risk of Parkinson's. While carbon monoxide is toxic, it may also act as a signaling molecule in low concentrations. The link between smoking and reduced Parkinson's risk is not new, with previous studies showing similar results. Researchers are exploring other explanations, including nicotine's potential effects on dopamine-related brain circuits. However, smoking remains linked to serious health issues, and the goal is to identify beneficial biological effects without the harmful impacts of tobacco.