Cannabis allows connections to be made between concepts which normally seem unrelated.
Which leads to the problem of thinking up connections between ideas that are actually unrelated. Creative, interesting, neat-sounding insights are not always true insights.
Also, I suspect that different brains respond differently to this kind of experience. I know that a friend of my parents' is a mathematician by profession and frequently smokes marijuana to "help his thought process." As for myself and the small amount of personal experience I have, the feeling of being high isn't an unpleasant one and can even be fun as an experience in itself, but the quality of my thought processes drops quickly and if I'm actually trying to accomplish any kind of specific goal, being high (or drunk) quickly becomes irritating.
I do think your idea might be valid in the sense that anyone brainstorming under the influence of drugs is likely to produce more ideas than someone who is sober. Even if a lower percentage of those ideas are useful, someone whose sober thinking process is rigid or self-censored, and who thus has trouble coming up with any ideas during a brainstorm, might benefit from a little de-inhibition.
At the Ohio meetup I speculated that marijuana may be useful for getting a higher score on creativity tests such as Guilford’s Alternative Uses Task.
I have not tested this idea, just speculated about it. For all I know, the experiment has been performed already.
First allow me to show you my preliminary data.: http://www.reddit.com/r/bestof/comments/obtqe/its_they_live_these_are_reddit_robots_programmed/
Introduction
I think I may have found a novel use for an old technique, which may or may not have implications for rational decision making. I am open to constructive criticism or even deconstructive criticism if you make a sound argument. Ultimately, I would like the experiment to be put to the test. If you have the supplies and know-how to carry it out, then feel free to try it and report your findings.
The Goal:
Methods:
Some evidence that the Cannabis route might be a good one to pursue (more references to be added):
Anecdotal evidence:
Conclusion
References
What I'm missing. To be included later: