One of the unexpected side effects I had trying marijuana for the first time was significantly more vivid mental imagery. Probably not particularly useful to you, but I just thought I'd mention it.
A past neurofeedback provider told me that I would like marijuana because it promotes alpha waves and I have fewer alpha waves than most people do. I've never tried the drug.
This is the public group instrumental rationality diary for July 16-31.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Immediate past diary: July 1-15
Next diary: August 1-15
Rationality Diaries archive