I'll buy that for certain populations or gargantuan doses it can have hallucinogenic effects - but last I heard it was not classified as a hallucinogen but a euphoric. What is your source for your claim?
PDR for one.
Any medical text used to define drugs (the kind of books used in nursing schools and medical schools, not the kind found in head shops).
For instance:
The term “psychedelic” is used interchangeably with “psychotomimetic” and “hallucinogen”, thus it can refer to a large number of drugs such as classical hallucinogens (LSD, psilocybin, mescaline, etc.), empathogen-entactogens (e.g. MDMA), cannabinoids, and some dissociative drugs.
There are hundreds of other sources, but you can believe what you want. I have learned what I know directly from licensed professionals that work daily with such drugs.