used the little blucig ( not alot of vapor it sucks dont buy one get a 510 if your backordered cancel and get a 510. ) for the flight. sitten between two nice women. i cupped held breath exhaled into the little air vent without issues the complete flights ( 3x in all) without any issues. no one noticed the vap or the lil light due to holding breath and cuping the cig. at the end of each flight i informed the people next to me what i was doing. None were upset or against the idea. I would not suggest open vapor in the air. or any thing that looks like white powder smoke, bottle of juice sudden movements or a 1/2 empty coffee cup.