Almost 50,000 counterfeit cigarettes have been seized in the past week.
It follows searches in Cavan and Dublin.
Following the search of a home in Cavan yesterday evening, Revenue officers seized just over 41,000 unstamped cigarettes.
The cigarettes branded NZ, West, and Pall Mall have a retail value of €26,000.
The detection was made with the help of Revenue detector dog Bill.
Meanwhile, Revenue officers at Dublin Port seized cigarettes and alcohol worth almost €10,000 during a routine search last Friday of a vehicle which came from Romania via Holyhead.
An additional 165 litres of alcohol comprising of vodka, beer and wine was also seized from the vehicle.