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I'm guessing that the flow of air from that gadget was going past your mouth and acting a bit like a vacuum cleaner, attempting to suck air out of your mouth and thereby making it harder to breathe in. When air moves, its pressure drops, and that's why you get a suction effect. You can see this effect when you blow between two balloons held a few inches apart - they get sucked together rather than pushed further apart. It can't be quite that simple though, because if you set all the air in a room moving round and round in circles, the pressure can't simply drop throughout the room without also going up somewhere, or can it?
maybe due to turbulence ... http://hyperphysics.phy-astr.gsu.edu/hbase/pturb.html#turbhttps://en.wikipedia.org/wiki/Turbulent_flow[ c.f. laminar flow ... http://hyperphysics.phy-astr.gsu.edu/hbase/pfric.html ]
I wonder if it's also difficult to fart in a strong wind?