My money is on some combination of "comppletely made up" to "psychosomatic".

We see no better evidence of this than how cops treat fentanyl exposure. Cops act like if they're in the same room as fentanyl they might die. This has been perpetuated in media. Thing is, it's completely made up.

Fentanyl is no more dangerous to handle than talcum powder. I mean, don't ingest or inhale the powder. There are no "fumes" however.

But the cops themselves believe this to the point that they report oversdoses in the field and have legitimate panic attacks for fear of exposure [1].

Havana Syndrome was suspicious from the go. Just the association with Cuba screams CIA psy op.

[1]: https://www.npr.org/2023/05/16/1175726650/fentanyl-police-ov...