The missing and most important part - regular solderers should be aware of the hazards caused by soldering fumes.
I think regular solder users are well aware of the hazards, and any workplace should have done a risk assessment long ago regarding this to comply with H&S at Work regulations
If you look at the H&S guidelines on this matter, there are guidelines on 8 hour max exposure recommendations on `Rosin` type fluxes.
As for the casual DIY solder/flux user, little or no risk, as how many 44" eagles would they building?
I have been using solder / flux professionaly for the last 35 years and never had any issues.