It was info I already had (which a reader could glean from my comment),

Could they?

do cocaine (although I’m pretty sure it was speed back then, but I’d still take it).

…in response to a reference to cocaine cola. That doesn’t sound like you were aware cocaine cola was actually a thing, but rather sounds like you were saying people weren’t using cocaine much but were doing speed instead, implicitly suggesting cocaine cola wasn’t a thing, at least not commonly.