I have read that smoking and Parkinsons are related...smokers don’t get Parkinsons....interesting thing is my girlfriend and neighbor developed a nasty case of Parkinsons after she quite smoking.. Died within 2 years of quitting...Was a long time smoker (none filtered Camels)
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There have been studies that show a lowered risk up to about 54% but smoking is not a blanket protection from Parkinson's for every smoker. As for quitting and then getting Parkinson's I think that must just be luck of the draw.
FTA: "We also showed that associations did not differ by sex or educational status. Although we found that current smokers and those who had continued to smoke to within five years of Parkinson's disease diagnosis exhibited the lowest risk, a decrease in risk (13 percent to 32 percent) was also observed in those who had quit smoking up to 25 years prior to Parkinson's disease diagnosis."