Do we lose neurons or neuronal stem cells every time we blow our nose?

I guess I will submit this question to the Ask the Experts section of Scientific American. It was a witty remark by a senior scientist at a presentation on neural stem cells and aging last week, here at Tulane. I laughed so much that I had to blow my nose disproving that good jokes keep us smart. Here we are:

asktheexpertsblownose