"This case raises novel questions about the scope of the government's authority to force the manufacturer of a product to go beyond making purely factual and accurate commercial disclosures and undermine its own economic interest -- in this case, by making 'every single pack of cigarettes in the country mini billboard' for the government's anti-smoking message," wrote Judge Janice Rogers Brown of the U.S. Court of Appeals for the District of Columbia Circuit.

The FDA "has not provided a shred of evidence" showing that the graphic labels would reduce smoking, Brown added.

Her opinion largely echoed the complaints of five cigarette companies, including Lorillard Inc and Reynolds American Inc, that challenged the rules.

The FDA has argued the images of rotting teeth and diseased lungs are accurate and necessary to warn consumers -- especially teenagers -- about the risks of smoking.

The health agency said on Friday that it does not comment on possible, pending or ongoing litigation. The U.S. Department of Justice, which argued the case for the FDA, said it needs to review the ruling before deciding on next steps.

The Campaign for Tobacco-Free Kids, which has vigorously supported stricter cigarette laws, urged the government to appeal.

"Today's ruling is wrong on the science and law, and it is by no means the final word on the new cigarette warnings," said Matthew Myers, the group's president, in a statement.

Youth epidemic
The Centers for Disease Control and Prevention estimates some 45 million U.S. adults smoke cigarettes, which are the leading cause of preventable death in the United States. And the World Health Organization predicts smoking could kill 8 million people each year by 2030 if governments do not do more to help people quit.

The U.S. Surgeon General warned in March that youth smoking has reached epidemic proportions , as one in four U.S. high

Congress passed a law in 2009 that gave the FDA broad powers to regulate the tobacco industry, including imposing the label regulation. The law requires color warning labels big enough to cover the top 50 percent of a cigarette pack's front and back panels, and the top 20 percent of print advertisements.

The FDA released nine new warnings in June 2011 that were meant to go into effect this September, the first change in U.S. cigarette warning labels in 25 years. Cigarette packs already carry text warnings from the U.S. Surgeon General.

But the ruling against the FDA means tobacco companies will likely not have to comply with the requirements for now, especially given divergent court rulings.

The U.S. Appeals Court for the 6th Circuit, based in Cincinnati, upheld the bulk of the FDA's new tobacco regulations in March, including the requirement for warning images on cigarette packs.

Most countries in the European Union already carry graphic images to illustrate the health risks of smoking. Earlier this month, Australia took a further step to limit smoking advertising by banning company logos on cigarette packs, and the EU said it was considering a similar ban.

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