I have a friend who refuses to blow his nose. He prefers to snort it back up into his belly. He insists this is an effective way to get rid of it, since you’re just shitting it out instead of blowing it. He also says that blowing his nose hurts his nasal passages.
I have a bit of personal experience in this field: I have had brutal hay fever all my life and have dealt with more gallons of snot than any human ever should.
I confess that my concern with this matter is that I get grossed out hearing his burbling snorts all the time. But I honestly think that nose-blowing is better, first because it’s more effective at removal (you have much more power expelling air than inhaling it - one good honk can clear the passages right out), and second, because, well, your body is trying to get rid of it, so why not get rid of it instead of redirecting it to another part of your body?
And I think that poor little his nasal passages will get used to it.
Any advice? I’d truly appreciate links to official sites as he won’t take my word for it (even if my word is backed up by wise Dopers).