Okay, I’ve been hearing persistent rumours that sneezing kills brain cells. Anyone here know whether this is true? Does it matter?
Not in your case since you obviously don’t have any if you believe that. 
Just kidding. Brain cells (neurons) are continuing dieing, as do all other cells. If you live long enough, there won’t be any left. Especially if you continue to sneeze.
AH-Choo!
Now, what was the question?