Well, I am not so sure that is true. Seems like often folks with "years of dedicated practice" are devoted/addicted to the path and not awakening. It don't seem fair, but I suspect the man or woman that took some mushrooms or other hallucinogen and by golly had an awakening experience may learn just as much as the man or woman with "years of dedicated practice". Not always true, I am sure, but I don't discount it. I am not sure marijuana is a powerful enough hallucinogen to bring about surrender, but I don't know.
In fact, I don't know anything.