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Smoking significantly reduces risk of Parkinson's disease.

Would you please link to the relevant study?

Here is one, http://aje.oxfordjournals.org/content/155/8/732.full

A reduced risk for Parkinson's disease (PD) among cigarette smokers has been observed consistently during the past 30 years. Recent evidence suggests that caffeine may also be protective. Findings are presented regarding associations of PD with smoking, caffeine intake, and alcohol consumption from a case-control study conducted in western Washington State in 1992–2000.

Being a cigarette smoker was observed to reduce risk of PD. This study does not tell us if it's the smoking itself that's causing this, or some other trait of cigarette smokers because the studies weren't randomized.

Here's something related: http://www.ncbi.nlm.nih.gov/pubmed/10857708

Definitely not "smoking", and not about preventing parkinson's. But it is one study that shows nicotine helps with some aspects of the disease.

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