I think it all depends on if your on an empty stomach or not. I've eaten a crap load of shroom and not felt anything, after eating regualar meals throughout the day, maybe eating a little more than nececarry (I am a hefty guy after all)

but other times I've fasted and drank nothing but water all day, then had only a gram or 2 or shroom powder and was feeling realy wierd/calm in good way tho. another time I overdosed and had to drop to the ground every couple a minutes cuz I was haveing such hardcore visuals.