I always looked at it like this... We already have a bunch of gates open in the brain, to receive information. It's like one is closed but when you "get high" it opens up that gate and allows for more info to get through... not much more... but still enough so that it's noticable(sp) and if you look into it. Then you realize... you'll pick out the stupid from the non-stupid. Pick out bullshit away from everything else... or something to that effect.