I once read, I believe in Prevention magazine many years ago, an article called "Toxic Tears". Apparently there are certain toxins that will only leave your body through the tear ducts. I found it hard to believe at first, and I would KILL to find the article to re-read it again... It makes sense to me. After a hard cry, there is a certain odor that lingers in the nasolacrimal ducts that I cannot identify, but I do know that you always feel better afterwards.