Kostić visited and gave his support to two hunger strikers from the Serbian Progressive Party (Srpska napredna stranka, SNS) in Niš in April 2011."Smiljko Kostić posetio štrajkače u SNS-u", Južne vesti 18 April 2011, accessed 28 December 2021. In October 2021, he expressed interest in building a tobacco factory in Leskovac."Smiljko Kostić namerava da gradi fabriku duvana u Leskovcu", Jugmedia, 28 October 2021, accessed 28 December 2021.
