There can be no doubt that endogenous chemicals are modulating these experiences. There is no question whatever. That all phases and modes of consciousness are modulated by endogenous (sometimes in concert with exogenous) drugs is a pharmacological fact. This is just the way the brain works. Another example of the brain in action is, any time you get hungry, or find something amusing, or get a good feeling, whether you have just smoked pot or not, your cannabinoid receptors are being activated. Feeling good or doing something you are good at increases levels of dopamine in your brain, the same thing cocaine does. And so forth.
The only question is whether it's DMT or something else. The brain is not known to produce 5meodmt so it's probably not that. Rick Strassman and others have suggested DMT plays a primary role in these types of experiences, but it will have to be determined by experiment. Until then all we have is speculation. However given the subjective similarities between certain spontaneous experiences and certain smoked DMT experiences, a fairly convincing case can be made. Just not a definite one.
The only question is whether it's DMT or something else. The brain is not known to produce 5meodmt so it's probably not that. Rick Strassman and others have suggested DMT plays a primary role in these types of experiences, but it will have to be determined by experiment. Until then all we have is speculation. However given the subjective similarities between certain spontaneous experiences and certain smoked DMT experiences, a fairly convincing case can be made. Just not a definite one.