I am somewhat bemused by the posts on these subjects. I smoked 4 packs/day for thirty years and quit about 12 years ago when spots were discovered on my lungs. I drank 6-8 cups of caffeinated coffee until I developed PD 1 1/2 years ago and read somewhere that caffeine was a no-no for pwp. So I switched to decaf coffee in greatly reduced amounts and switched to green tea for those rare occasions when I drank tea. Now I don't plan to start smoking again even if it were proven to be neuroprotective, but I sure could revert to my old coffee drinking style in a heartbeat. Is anyone saying with authority caffeine or no caffeine? Paul H. Lauer