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A recent french study of 140 PWPs and 200 non PWP of the same age group has tried to find relationship between evironmental factors and the occurence of PD. Their findings were that environment does not seem to play any role, tobacco seems to be a protective factor . Being exposed to toxic substances does not seem to present a significant risk but drinking tea seems to be a significant risk. After all why drink tea when wine is available? Cheers Maryse