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>> not even smoking and >> alcohol consumption (known to be related to PD risk) > > > As far as I know, all that came out from some stats is that > there are less > PWPs among people who smoke and drink but it was never said > that smoking or > alcool protected against PD. Same goes with coffee drinkers. PD > may be linked > with a type of personality . My understanding is that there are numerous studies with this result and that the conclusion is well accepted. I personally agree with you that people who are addicted to smoking, alcohol, etc. likely have a personality type that is less likely to result in PD. However, there are investigators who are performing research into the chemical components of tobacco smoke, looking for neuroprotective agents. I am skeptical, but I wish them every success. My point above, though, is that when you do a study of this sort, looking at differing rates of occurrence of some endpoint as a function of some exposure, you need to adjust for other variables that may affect the outcome of interest. ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn