There's even a fun tie-in with stoned ape theory (which I don't endorse, but is a fun theory). In one version of the theory, humans eat magic mushrooms and become conscious or develop higher thought. In the ISM version, magic mushroom spores - or the genes that make them psychoactive - were seeded from the ISM three million years ago, leading to the evolution of homo erectus and homo sapiens.
This is a fun theory because it would be easy to falsify with a an experiment showing that magic mushrooms evolved their hallucinatory properties much longer than 3 million years ago. But note that you'd have to do so xenogenomic theory, to control for the possibility that the material came in from the ism itself as much older than 3 million years. Such material would show terrestrial genomic age metrics, which could make us think magic mushrooms evolved long ago on the earth, when in fact it evolved in another biosphere.
Anyways, you're right! This IS making me feel more connected to the universe!