history: I saw a grown woman pick her nose and eat it earlier.  I was so grossed out. I saw a grown woman pick her nose and eat it earlier.  Okay_comma_ so I never understood why people ate it. What is it about it that makes them want to do that? I just flicked mine. And I thought it stopped at a child's age. Really interesting. I was so grossed out by it.  I think it has to be a oral fixation or something like that.
current: I've 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'm sure that's just as bad bacteria-wise. Maybe the booger eaters are on to something.
next: Maybe it helps build their immune system.