i saw a grown woman pick her nose and eat it earlier. i was so grossed out.
maybe it helps build their immune system.
i have heard of oral fixations before, but only in the context of like chewing fingernails and smoking cigarettes, etc. but i guess if i think about it, a lot of people chew fingernails, and i am sure that is just as bad bacteria wise. maybe the booger eaters are on to something.