Yeah, but .... language, the vernacular in particular, is not scientific discussion. It's communication of ideas in general. You know, like if one person is outside on the street, vaping, blows out some <whatever> and another person asks "what is that?" and the first person says...______________. None of them are scientists having a scientific technical discussion BTW. I understood that the OP wanted, at least in part, to fill in that blank. I could be wrong. We do decide what words mean, collectively, and they (the words) change quit a bit over time. Both in meaning, and in pronunciation.
Anyway, the scientific discussion aside, if you'll let me indulge my arbitrary preference.... I like FOG as an easy answer. Water "vapor" will get the point across, and although not strictly accurate, I like that too. When the study comes out, we can probably say "mostly water vapor" and communicate the idea. Even though water vapor would actually be invisible. Just a ramble from me too.