But why the pineal gland is busy producing potent psychoactive molecules is another different and interesting question.
One oddity mentioned by the same author of DMT: The Spirit Molecule is that there are people who do not have a pineal gland (e.g. removed due to cancer, or damaged.) If a hypothetical DMT-dump is the hypothetical means a spirit-animus "disconnects" from the body, what happens if this piece of the brain is missing?