Do people meet alien entities on DMT because they expect to meet alien entities? It’s not an idle question, it’s grounds for a fun experiment, too. From the Rodruigez paper:
To validate or falsify this hypothesis, the experimenter should perform a single blind study in which human subjects are used who have never heard of DMT and its extraordinary effects on the human psyche. These subjects are told that DMT inebriation will provide them solely a visual and auditory hallucination. By simply defining the experience as that experienced in front of the veil, the ill-informed subject will have no preconception as to what is possible given the right conditions for entering into the DMT-induced alternate reality. If subjects continually return only to describe the world in font of the veil, then it can be concluded that the DMT experience can be influenced by biasing the subject. In this sense, the hallucination is driven by preconceptions and therefore may be understood solely as an inconsistent subjective hallucination. On the other hand, if the inexperienced human subjects return with testimonies of encounters with alien beings, then DMT is responsible for alien entity experiences. It is noted that this experiment has already been implemented with positive results. Dr. Strassman’s work used unassuming human subjects that did, in fact, return from DMT inebriation with entity experiences (Strassman 2001).