Last year, the Fair Trade Commission delivered a fine of 2.5 billion won ($2.19 million) to KT&G for forcing retailers not to sell cigarettes produced by foreign companies.
KT&G offered cigarettes at lower prices to retailers at rest stops across the country to exclusively sell its products.
Despite the move, only three out of 239 highway rest areas sell foreign cigarette brands such as Marlboro or Dunhill, the sources said.
"Nothing has been changed despite the FTC's order for KT&G's anti-competitive behavior more than a year ago," said an industry source on the customary condition of anonymity. (Yonhap)