I am a Mouth Breather and find it difficult to breathe through my nose. How can I overcome this habit?

Should you be a natural "mouth" breather, then this second step will help to emphasize breathing in through your nose and breathing out through your mouth. Here's how you can do it. When you close your mouth to inhale, place your tongue against the roof of your mouth, relaxing your throat much as you do when you yawn. After you have inhaled as much air as possible, hold your breath for a moment and change the position of your tongue so that it rests behind the lower teeth. Then open your mouth slightly and exhale gently, as though you were slowly blowing out a candle. Repeat this several times. . . .