Lol I tried this for two breaths and already got a head rush. I'm not even trying to play an actual flute, just sustain pressure from my mouth while I inhale and then switch back to blowing from my lungs.

I wonder if master flutists get a kind of natural high any time they play at a high level that uses this technique and that's why they stuck with the flute long enough to master it.

Or hell, if dopamine for non-ADHD people gives good feelings from normal stuff, is that why anyone sticks with things long enough to master them? Just flute masters might get that extra head rush on top of it.