Duster definately does a lot more then just make you "giggle". From my very short expierence with it(thank god) I had some crazy halucinations. Most of the time they were auditory, peoples voices sound all distorted and echo-like.. And you will likely black out..Or fall down.

Its not worth it at all, its seriously one of the stupidest things you can do in my opinion. Poisioning your mind. I wish I knew more about it before I tried that stupid shit.