i can understand in ‘through the nose’, since dust and other bits can be blocked by the nose hairs and mucus, and apparently the air is more likely to warm up when passing through the nose first, reducing irritation of the throat.
but what difference, if any, does exhaling through the mouth make?
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Breathing in through the nose also allows the air inhaled to be gently moisturised which means your throat doesn’t go dry unlike if you breathe in through your mouth. My wife is a serial mouth breather and it drives me mad because her voice has become weaker and she coughs very often during the night and I’m pretty sure it’s down to breathing in through her mouth nearly all the time
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