Not clear what you're saying - "a novel respiratory disease" - that sounds like you're talking about one condition although unnamed (I presume you refer to the health issues related to the addition of vitamin e acetate for which a strong correlation between that and serious respiratory illness in heavy vape users is well established - yes?). Are you saying there's two different conditions? Or that vitamin e acetate is not the cause? If so can you say what they are rather than being so non-specific? It leaves nothing to discuss really, unless you want only to announce it and not discuss it's provenance? (please say as I won't waste time discussing if you've no desire to examine it and are just putting it out there with no explanation).
Did you actually read that paper I linked to? Being a fact-checked peer reviewed scientific paper from one of the more trusted sources, are you saying it's wrong? If so, in what way(s)? And what's the evidence you're using to make that argument - a link would be great?
Or are you just saying your gut feels suspicious so there's a case for, what? some sort of conspiracy? Again you're not being very clear and precise about this.
If you read up you'll also find it absolutely didn't just 'disappear'! What's the mystery? Don't see it at all.
Personally, I think the really weird thing is how there are many real and damaging conspiracies out there, and yet most people only want to look for the unreal one's with no empirical evidence.