This is my experience of marijuana. As a consequence, I've only tried it a few times.
I previously would have said that if you have to learn how to experience the effect of a drug over multiple attempts, this was evidence that the effect was strongly influenced by social or anticipatory cues. I've been experimenting with modafinil and nicotine over the past few months, and while I think I'm aware of how they affect me, I still haven't been able to rule out the possibility that these effects are largely a consequence of my anticipating them.
My experiences:
Marijuana: First few doses didn't do a whole lot; I felt rather like I had a high fever. Makes me feel like everything is stupid, including myself. Memory is definitely impaired. Can make or break experiences; could never play Valley Without Wind again after playing it while inebriated, as it made it painfully apparent how pointless the game was. Makes subjective experiences somewhat more subjective. Designer drug variant 1: Thought I was going to die; time seemed broken up into fragments which were only loosely connected (linear time fe...
This is the public group instrumental rationality diary for April 15-29.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
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