So K- has been hacking, mostly in the middle of the night. I decided to give the ole internet Vicks Vaporub on the feet thing a try. Vicks on feet confused K-.
"Mom, what are you doing?"
"I'm putting Vicks on your feet. They say it is supposed to help your cough."
"Mom? My feet aren't coughing."
Edited to add: No, as I suspected, it didn't work. So I now officially can tell the people who keep sending me the e-mail that it's a bunch of bologna. Wasn't it nice of me to guinea pig my daughter for the health of the internet? :)