The Research Finding of a Negative Correlation Between Smoking and the Alzheimer's

The research finding of a negative correlation between smoking and the Alzheimer's type of dementia,i.e.,smokers were less likely to develop Alzheimer's type dementia,is generally interpreted to mean that

A) research findings are sometimes in error.
B) nicotine protects against dementia for most people.
C) smoking may be helpful in protecting people at high risk for Alzheimer's.
D) smoking may shorten the lives of smokers so they do not live long enough to develop dementia.

Correct Answer:

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