lol! i know you are stressed about this, but it's still kind of amusing.
my
DH is 28 and also picks his nose. But he doesn't eat it thank god... instead he rolls it into a ball and flicks it away... or puts it under my car seat... eewww.
i think it's a boy thing!!
i remember being a picker when i was little and my dad would always say "did you pick a winner or only second place''. it's a sort of kind way of embarrasing you to stop.
dunno if that'll help.
good luck!