LSD is a solid (I think) so giving a volume probably means a solution which is a weird thing to talk about since it doesn’t really mean much.

Exactly. LSD is a solid.

It’s as if I said I had 0.5 mL of salt. It tells you nothing other than you have water with salt in it.

the state of matter is a function of temperature and pressure.

LSD is a solid, sure -- below 175 F. Then it's a liquid, but it decomposes into simpler molecules before it boils, so it doesn't really have a gaseous form at STP.

It probably decomposes before it melts, it’s a very fragile molecule.

A more reasonable assumption is that it’s a saturated solution at NTP but that’s still quite an assumption.