In my experience hallucinations usually come in some kind of a setting or a theme, they exist in a framework, a context. They have a continuity, like an ongoing story in a movie, or a book.
Now, there is very little doubt that psychiatric medications can effectively and convincingly disable hallucinations. And in my experience, that is exactly what they do.
The trip ends, the hallucination ceases, and it’s back to reality. Everyone is familiar with this on some level, in themselves, or the other.
But what happened to the story? The movie, the context, the setting? Where did it all go. If one was to start hallucinating again, does it pick up where it left off? Does it keep going in the background, and you are only subconscious to it? Is everything new? Are the hallucinations different?
What’s I find, is that after departing, when you walk back into hallucination, things do not pick up right where they left off. Someone turned off the movie, or closed the book, and now there is a new movie, or a new book.
Whatever continuity hallucinations had before they were turned off, is broken on some level, and a new continuity begins, often with new settings and themes.
You don’t return to the same continuity, with a little time having passed, but something new comes about.
That said, though someone may have changed the movie, they did not change it to something radically different, the story did not switch from “The Godfather,” to “Lord of the Rings.”
It’s more like the story switched from “Iron Man,” to “Captain America,” different stories, settings, and themes, happening in the same overarching universe, with new characters coming and going, some remaining, changing and developing over time.