Digging for green gold is normal behaviour but let's leave ingesting the little balls of snot to the kids.

Everyone – adults and children alike – occasionally picks their nose to free up the passages. In fact, the diameter of our nostrils has probably evolved to match our finger size, for this reason.

Children often eat their bogies because they are curious, and it’s a convenient method of disposal. There’s no particular medical or dietary advantage, but eating bogies is harmless.

Resource BBC