Smoking and Alzheimer’s Medical studies indicate that smokers are less likely to develop Alzheimer’s disease than people who never smoked.  a) Does this prove that smoking may offer some protection...

Smoking and Alzheimer’s Medical studies indicate that smokers are less likely to develop Alzheimer’s disease than people who never smoked.

 a) Does this prove that smoking may offer some protection against Alzheimer’s? Explain.

 b) Offer an alternative explanation for this association.

 c) How would you conduct a study to investigate this?