The flight, from the Gold Coast to Sydney on Sunday, was carrying some passengers returning from a music festival, Sydney's Daily Telegraph reported today.
"We have been told there are sniffer dogs and quarantine officers waiting in the domestic terminal," the newspaper reported the flight attendant, who was not named, as saying.
"If you need to dispose of anything you shouldn't have, we suggest you flush it now."
The airline did not confirm the words but said in a statement that it was required to play a pre-recorded quarantine message, which could also be delivered by the cabin crew, to passengers.
"Our cabin crew play a vital role in ensuring the safety and wellbeing of our customers," Jetstar added.
"We apologise to customers offended by the comments. We're addressing the matter with the cabin crew member involved."
It was not clear if there were dogs and officers at the terminal.
The crew member's remarks received a mixed response.
One passenger on board the flight told the Daily Telegraph they were "shocked", adding: "Why would you tip people off about this?"
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