Do the realities experienced when a person consumes a hallucinogenic compound have an independent existence, or are they subjective interpretations of biochemical interactions within the brain?

Who has the right to determine whether certain altered states of consciousness (a person who has consumed coffee, for example) are acceptable, while other altered states of consciousness (such as those experienced by long term hallucinogenic abusers) are unacceptable? Does anyone? At what point might these regulations be taken as a form of “mind control?”