Do you dig your nose?

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I still remembered last time when I used bus to go study,I noticed a guy in the bus kept on digging his nose. It was disgusting. Yucks...I had seen quite a number of men had this type of habit. Did you see one? Even some guys keep long nails especially the last finger's nail just to make use of it to dig nose. I really cannot imagine any further.What do you think about this?