Professor Andrew Lees of the University of London, who led the research, said: "If you have never smoked you have double the risk of Parkinson's disease but we do not know the reasons for that."
Or not..
They suggested it may be the risk-averse nature of the Parkinsonian personality, rather than the physical effects of smoking, caffeine and alcohol on the brain that influences disease rates.
Time to go bungee jumping.
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