Is this just a mistake or Bethesda really is changing a massive story idea that contributed to fallout 2 world as we know it?

I'm assuming they knew about its lore but they had a differing idea for it and how to involve in their spin of the Fallout universe.

I'm sure Myron would be pleased...

Butcher Pete is to meat what Bethesda is to lore.

Where is it stated that Jet is a pre-war drug? That would be a pretty massive screw up on Bethesda's part.

Who says that Jet in FO2 wasn't a rediscovery of a pre-war stimulant?

In one of the terminals in Vault-tec Regional HQ Martin's personal log.

And T-60 is now the best Power Armor before the war. And tanks were used just before the apocalypse, so the world had not run out of oil which caused the great war and the atomic armageddon, and the development of Power Armor. Also supported by the fact that there are gas canisters everywhere.

When you play a Bethesda game, you're supposed to just smile and nod as "story" goes trough one ear and out the other

Do you know what Jet is?

(Part of the reason Jet is what it is, is because of the post-war environmental situation; they could not grow the plants they would have liked to have.)

Cow dung from cows fed a contaminated pre-war protein extract that was discontinued for being easily contaminated into a methamphetamine-like substance from bacteria. Well, Brahmin dung, but I don't think they have that much differenced in their digestive system from regular pre-war cows.

What, you don't think pre-war druggies figured out the cow-dung fume harvesting trick?

The thing about Bethesda's NPCs is that they lie sometimes. Just because an NPC says something it doesn't make it canon. Beth has told us this before.

Well, wrecking the lore is not unexpected, after all Bethesda is the place where

Doubtful they gave it the same name and the same inhaler.
(Or had the same mushrooms for that matter. They might well have been mutant 'shrooms, not unlike the rest of the post-war plant and animal life.

*And by that I do not mean 'talking mushrooms'; though that's kind of fitting for an hallucinogen. )

Jet was local to So-Cal; and any unrelated rediscovery, or pre-discovery of it, should have been a different drug with its own development history, and its own (distinct) characteristics. It's blatant recycling [again] to just reuse the local drug from Fallout 2.

IT could be that while they share a name, they are two different things, made of different stuff (even if they have similar effects)

I was under the impression that [new]Bethesda operates under a flat policy of never lying to the PC [to the player]; something less than desirable in an RPG IMO.

Yeah.