Backbone (1975)

An unbearable stench makes quite wide confusion among the residents of Belgrade. The microbiologist Pavle can not remember immediately where he smelled it, but recalls the event he witnessed as a child and the smell of a burning human. A visit to the crematorium gives him the assurance: The high number of suicides in the city has meant that the ovens are in continuous operation and will probably stay that way - because the stench is slowly making other people commit suicide, too.

Unfortunately the movie Backbone is not yet available on HBO Max.