It should be socially acceptable to play possum in public, when you hit your limit. If you're curled up in the corner, because you got overstimulated, I'll bring you a blanket and a snack.
@RickiTarr But seriously, I agree. It should not be necessary to start smoking just to get some quiet-time. I work on my feet, so can just go hide behind a wall, close my eyes and put my hands over my ears.