Years of smoking associated with lower Parkinson's risk, not number of cigarettes per day

Researchers have new insight into the relationship between Parkinson's disease and smoking. Several studies have shown that smokers have a lower risk of developing Parkinson's disease. A new study published in the March 10, 2010, online issue of Neurology(R), the medical journal of the American Academy of Neurology, shows that smoking for a greater number of years may reduce the risk of the disease, but smoking a larger number of cigarettes per day may not reduce the risk...

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