i've only used it twice, both times i was so fucked up that i don't even remember taking it off.... that shit hits you like hard core, and well just imagine sitting in a room that's completely filled with weed smoke, after a minute or two you start getting lightheaded from the lack of oxygen, plus all the thc pumping through your head.... >.> so yea, it's not for the light of heart...and if you have fear of small places, you wouldnt' be able to handle even putting it on..