Customs seized huge haul of black market cigarettes and tobacco in Louth in 2016
Customs officers seized more than 124,500 cigarettes and 12.9kg (28lb) of tobacco in one county during 2016.
The Revenue service said its investigators launched a series of operations to disrupt the black market in the Louth area alone.
At least a dozen brands were discovered in various seizures including Excellence, Marlboro, MG, Jing Ling, Jim King, L&M, NZ Gold, Marble, Regal and Winston, as well as Amberleaf, Flandria and Samson loose leaf tobacco.
Customs officers also seized 7,470 euro (£6,360) in cash and a car.
Revenue said the contraband cigarettes and tobacco would have been worth more than 74,000 euro (£63,000) if sold in the shops and represented a potential loss of almost 60,000 euro (£51,000) to the Exchequer.
It said several people had been questioned and files were being prepared for the Director of Public Prosecutions.