What percentage of the mass of the interstellar medium is typically accounted for by interstellar dust?

Answer

About 0.7%

Despite dust profoundly affecting the appearance and environment of a nebula, its mass contribution to the overall interstellar medium is quite small, making up less than one percent.

What percentage of the mass of the interstellar medium is typically accounted for by interstellar dust?
SpaceastronomycompositionnebulaElements