I'm on a local fire department, and we've had this taught as one option to try and manage air use with the SCBA packs. I find it useful, but since I'm already c

I'm on a local fire department, and we've had this taught as one option to try and manage air use with the SCBA packs. I find it useful, but since I'm already conscious of breathing (with some slight effort to inhale), I tend to feel the need more than without the pack. It does seem to help to hum (for some) or at least purse your lips (for me) to drag out the exhalation step without having to inhale right away. I would certainly like to be better at this though, those packs don't last that long.