Hahnemann’s use of the term _Miasm_, tho the term most available in his day to refer to an agent of infection & the resulting disease, has given rise to a great deal of confusion.
Some have dismissed his reported observations out of hand, on the assumption that “miasm” refers specifically to aethereal components of “bad air.”
Others have suggested that the chronic miasms, often just shortened to “miasms,” represent “underlying weaknesses” or “diatheses” (“constitutional predispositions”) or “terrains of susceptibility.”