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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 ... ...sorry, you cannot view external links. To see them, please
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I wonder if it's also difficult to fart in a strong wind?