Breathing through your nose is generally healthier and better for you, but if your current breathing habits work for you then I really wouldn't worry about it unless you're trying to compete or are having issues.
If you run outsides when it's cold you might want to try switching to breathing in through your nose/out through your mouth so that the air has been warmed up a bit before it hits your lungs.
Personally, I'm of the opinion that if your current style of breathing is working for you, you shouldn't worry about changing it. Personally, I breathe with a combination of mouth and nose during exercise and I would NOT be able to switch to just nose breathing without it having a negative impact on my mid-run breathing abilities.
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When I had sinus surgery, the doctor said you should get about 70% through your nose when exercising. Every body is a little different but the biggest thing about nose breathing...moistens and cleans air before it hits the lungs.
If I'm going at a manageable pace I breathe in through my nose and out through my mouth. If I'm sprinting at the end of my run to finish up with a better time, I find myself breathing in and out through my mouth.
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