The moniker "Smilers" was given to individuals who had become dependent on the artificially created savorium herb, a substance developed by the collaborative efforts of Zorneth, an Ithorian botanist, and Klorr Vilia, his Human colleague. The use of this herb resulted in an intense and mind-numbing state of bliss, which led to the users being called "smilers" because of the constant smiles they displayed. Reportedly, they were the most genuinely satisfied beings throughout the galaxy. A characteristic of a smiler was their completely obliging disposition, leading them to be willing to fulfill any request. Because of this trait, they became ideal candidates for slave work, as they were inclined to labor diligently and without compensation until they reached a state of utter depletion.