A smoke pot
A smoke pot was a religious item, a large bowl, used to create smoke.
Smoke pots were in use during a meditation of Vulcan monks at the monastery at P'Jem when a commando of the Andorian Imperial Guard entered and disrupted the meditation. (ENT: "The Andorian Incident")
The smoke pots were not named in the episode but are listed in the props section of the call sheet.