Revenue officers at Rosslare Europort seized approximately 60,000 cigarettes on Thursday.
The cigarettes have a retail value of over €32,500.
Officers made the discovery after they stopped and searched two cars that disembarked a ferry from Cherbourg.
Detector dog Alfie assisted in the searches, and the smuggled cigarettes were found concealed throughout the cars and in a large metal container.
Revenue's detector dog Alfie | Image: Revenue
The cigarettes were branded 'L&M' and 'NZ Superslim Gold'.
A Lithuanian man in his 30s, who is currently a resident in Ireland, was questioned and his vehicle was seized.
A file is being prepared for the Director of Public Prosecutions (DPP).