never did them both, only one after another, but ive seen guys on that combo and they always was ok. one time 3 of us rolled and one of us shot h lil time before we dropped, so we all talked shit grinded teeth were all rolling nutts, the guy on h was the same, minus dilated pupils. they were microscopic, and he all went grinding teeth and rolled hard with those pupils it was fun!!!
an other guy ate e and snorted some h and just ''slept'' in the park on his roll lol, nothing unpleasant happened to him..
And WTF to combine laughing gas with h!?!?! its fun on weed, acid, and mybe on E itself but E+H+N2O sounds really weird.
BTW H has the craziest CEV's ive ever had on any drug!!! at least while after something else