is there any extra benefit to breathing through your nose?

on 4-5 mile runs, the first 2.5 are completely through my nose. Was introduced from d1 soccer player good friend from HS who I trained with during summers 08-10 . I don't know if there's any benefit, but it feels GREAT when I start breathing with my mouth again. In through nose, out through mouth from there. 8:00 mile pace