More than 250,000 kilograms of illicit tobacco has been found and destroyed in southern New South Wales.
Australian Tax Office (ATO) assistant commissioner Megan Croaker said 9.7 hectares of the crop, weighing the equivalent of 13 bulldozers, had been seized at Koraleigh.
"This was a sophisticated, organised operation," she said.
The tax office said it estimated the government would have missed out on $42 million in excise if it had made its way to smokers.
Officers also seized a picking machine and water pump from the property.
In 2019-20, it was estimated illicit tobacco costs the community $909 million in lost excise revenue each year.