Of course marijuana is a mild psychedelic. According to wiki a psychedelic are;
psychoactive drugs whose primary action is to enhance or amplify the thought processes of the brain. The term is derived from Greek ψυχη (psyche, “mind”) and δηλειν (delein, “to manifest”), or δηλος (delos, “beautiful”).
and are thought to;
disable filters which block or suppress signals related to mundane functions from reaching the conscious mind. These signals are presumed to originate in several other functions of the brain, including but not limited to the senses, emotions, memories and the unconscious (or subconscious) mind. This effect is sometimes referred to as mind expanding, or consciousness expanding as your conscious mind becomes aware of (or sometimes assaulted by) things normally inaccessible to it. At high levels this can overwhelm the sense of self and can result in a dissociative state.
That really says a lot on why it has the ability to improve the brain and perhaps make it more powerful, especially in the face of tough physics problems. From the more powerful psychedelics LSD and psilocybin people have even reported seeing objects in 4+ spatial dimensions. This really says a lot about their power to perhaps help the top minds in physics solve the M-Theory problems (by at least finding some evidence) and apply it to the so called “Theory Of Everything”.
But the only scientist I have ever heard who at least takes in pot is Carl Sagan. I think he did do a good job in his career helping show the public the wonderful world of science. I think Einstein did some too, although I don’t know for sure.
So what do these substances really do to the mind and brain?
A Better Way To Water