Which interior plaster should be chosen? Lime plaster/lime-cement? Experiences?

yes! In a smoker's household, the lime plaster also sometimes coughs.

If the plaster can convert CO2, then we should start plastering entire landscapes with it and solve the climate problem! :D

Plaster can actually absorb CO2! At least for a while.

I then hear out, then lime-gypsum plaster = gypsum plaster (as pure gypsum plaster might no longer be available). This red lime makes an expensive impression. The sack "Grund" costs around 13 euros and the sack "Fein" almost 30 euros.

I have now plastered many different manufacturers and could hardly notice any differences. We mostly plaster with lime-cement plaster because it is harder and more resistant to mold. However, since we have never had mold in the house anyway, neither with the old plasters nor now, I can say little about this effect. We have used gypsum plaster rather rarely. Also, in terms of handling, I cannot really name any significant differences.

Thank you. I had asked about window reveal in another thread. Here I will then try a lime-cement plaster. Akurit MEP or Weber lime-cement lightweight plaster IP 18E. (I'll see how many mm it can be nicely smoothed down to. According to specifications, at least 10mm inside or 20mm outside). Less would of course be great.