I second the reference to Doors of Perception. If you folks have the time, and you haven't already read about Sasha (Alexander Shulgin), give it a whirl. Wiki: http://en.wikipedia.org/wiki/Alexander_Shulgin

There's a movie on his life, isn't great but it's a decent watch, Dirty Pictures: https://www.youtube.com/watch?v=FA8ddx_iC_g