About $40,000 worth of cigarettes were stolen from a Palmerston shop and thousands of dollars' worth from a Maheno garage yesterday.
Sergeant Blair Wilkinson, of Oamaru, said police were investigating whether the burglaries, at 5.30am and 4.20am, were linked.
Cigarette robberies have been increasing - there were a series of them in Dunedin in January at service stations.
Palmerston Four Square owner David Muir said he was "pretty disappointed" by the burglary, which has made him rethink his security measures. No one was in the shop.
Palmerston Senior Constable Stefan Witehira said security camera footage was being reviewed.