A US lobby group has taken on Australia's plain cigarette packaging laws with an advertisement so hilariously bad it has to be heard to be believed.

Plain Packaging: Know the Real Facts by Property Rights Alliance features a voiceover attempting an Australian accent, that one YouTube commenter says is "so bad The Simpsons wouldn't even use it in a parody episode".

The unnamed voice actor rails against the "failed" experiment of plain packaging, despite the Australian Bureau of Statistics showing a marked decrease in smoking rates since its introduction in December 2012.

"The government embarked on a radical experiment to restrict consumer choice and destroy intellectual property," the voiceover says, in a mangled ocker accent.

"This cannot be justified under any circumstance. They violate international law, open the door to negative economic impacts and decrease consumer confidence."

The Property Rights Alliance is reportedly the brainchild of US-based lobby group Americans for Tax Reform, which boasts tobacco giants Philip Morris and RJ Reynolds among its clients.

Australia was the first, and so far only, country to implement plain packaging laws.