If you haven't experimented long and hard with the full spectrum of mind-altering substances drug dealers can sell you, it's difficult to work out what different highs will do to your grey matter. Sure, you could read Wikipedia; or, you can look at this wonderfully minimalist poster series instead.
Meaghan Li is a graphic design (and Public Policy!) student at Duke University, and made this poster series to illustrate the effects of different psychoactive substances. The visualisations are apparently based on "popular archetypes", and I am sure in no way reflect her own experiences or experimentations.
The posters are a good lesson in simple, effective graphic design -- although, I'm sure they hide some deeper meaning only revealed with the help of some extra inspiration. [Meaghan Li via YouTheDesigner]