amphetamine dosage: I don't seem to be getting much from it..? so, today i'm experimenting with speed, I took 30mg to start off with, and I got very sleepy and passed out for an hour, woke up and felt a bit more lively and took 70mg more.. i'm have a bit of restless leg and feel more focused with my eyes, but otherwise not much. I certainly don't feel like raving.  
the obvious conclusion is that it's bad stuff I have, but the dealer is reputable to the point of making this seem very unlikely.  
is there another answer? do some people just not react?