Sterile Masks should block miasma.

[Kotlol]

True, we need more punishing mechanics added on to the..

Maybe buff miasma to a disease chem on high overdose?

I have no problem with that.
People already ignore washing themselves and in the old days this may get you a disease, but now that's gone.

Miasma is only bad in high doses anyway. Most people will just brave the single stack of toxin damage and take a single vormit.

By making it a disease that can be easily avoided by: "REMOVING THE CORPSE" It will make janitors and such do their job more.
At the same time... this will give antags a reason to put rotting corpses in lockers to cause dismay.
I swear that antags are 10 times more tidy then crewmen.