Csikszentmihalyi on drugs and their effect
Freely translated, the author says that...

"Doing drugs is fine when performed under the guidance of experts in traditional, ritual contexts. Drugs reduce our perception of what is possible, and they reduce the perception of what we ourselves can achieve. Drugs do this until the two are in balance. This is pleasant. But, it is misleading and far greater joy can be achieved when one would stimulate the chances to achieve goals, and to enhance our possibilities to do great stuff." 

Honestly, I think this is a big mouthful of gibberish. But there you go.