Jacob, If marijuana were capable of being a sole cause of PD, then there would be a whole lot more folks my age who'd be shaking with me. Terry Brennan 39/17+ [log in to unmask] He said that a man in his early forties had been there yesterday. He was diagnosed with P.D. right then and there. He had smoked marijuana for years. Doc asked me to ask the fine people on the Parkinson's list if they had ever heard of P.D. being CAUSED by marijuana. He had not. Thanks to all who respond. Jacob