[NixNatAVanG InDaBurgh]

You know, as gross as this sounds, people have an unconscious habit of, (pardon my French,) picking their noses. It is almost a reflexive and nervous, or natural action, nearly impossible not to do, hardly ever thinking about it. Get this stuff on your fingers and wipe your nose, scratch it, or just do what everyone does and won't talk about. Bam, trouble. It would be a real good idea to be very, very aware of the unconscious things we all do. Being alert now could be the difference between life and death. Literally.

[TennesseeProfessor]

I don't know where the "don't pick your nose" idea got started, but it has no factual basis.