A US lobby group has released a volley of attack ads targeting Australia's plain packaging laws complete with a dubious Australian accent and copious use of permanent markers that have left policy advisers and viewers in stitches.

"In life, not everything you hear is always true" is the very prescient opening line of a three-and-a-half minute Youtube clip posted by the Property Rights Alliance.

"Especially regarding Australia's plain packaging experiment," or rather "ploin pickaging ex-spearmint", warns the voice over that appears to be attempting an Australian accent.

National plain packaging laws introduced in 2011 are an attack on "liberty" and the "very core of free societies" according to the advocacy group for intellectual property rights, which accuses the Australian government of hood winking the public by touting the success of its anti-smoking policies.