The Food and Drug Administration has released nine new cigarette pack warning labels that depict in graphic detail the negative health effects of tobacco use, the most significant change to U.S. cigarette packs in 25 years

Among the images to appear on cigarette packs are rotting and diseased teeth and gums and a man with a tracheotomy smoking.

Also included among the labels are:

• The corpse of a smoker.
• Diseased lungs.
• A mother holding her baby with smoke swirling around them.

The labels include phrases like "Smoking can kill you" and "Cigarettes cause cancer," and feature graphic images to convey the dangers of tobacco, which is responsible for about 443,000 deaths in the U.S. a year.

Each label includes a national quit smoking hotline number.

The labels will take up the top half of a pack of cigarette packs. Warning labels also must appear in advertisements and constitute 20 per cent of an ad. Cigarette makers have until the fall of 2012 to comply.

U.S. joins other countries in issuing warnings

Mandates to introduce new graphic warning labels were part of a law passed in 2009 that, for the first time, gave the federal government authority to regulate tobacco, including setting guidelines for marketing and labeling, banning certain products and limiting nicotine.

The announcement follows reviews of scientific literature, public comments and results from an FDA-contracted study of 36 labels proposed last November.

In recent years, more than 30 countries or jurisdictions have introduced labels similar to those being introduced by the FDA. The U.S. first mandated the use of warning labels stating "Cigarettes may be hazardous to your health" in 1965. Current warning labels — a small box with black and white text — were put on cigarette packs in the mid-1980s.

The FDA says the new labels will "clearly and effectively convey the health risks of smoking" aimed at encouraging current smokers to quit and discourage nonsmokers and youth from starting to use cigarettes.

The new labels come as the share of Americans who smoke has fallen dramatically since 1970, from nearly 40 per cent to about 20 per cent. The rate has stalled since about 2004. About 46 million adults in the U.S. smoke cigarettes.

It's unclear why declines in smoking have stalled. Some experts have cited tobacco company discount coupons on cigarettes or lack of funding for programs to discourage smoking or to help smokers quit.

Legality of labels part of lawsuit

While it is impossible to say how many people quit because of the labels, various studies suggest the labels do spur people to stop smoking. The new labels offer the opportunity for a pack-a-day smoker to see graphic warnings on the dangers of cigarettes more than 7,000 times per year.

The FDA estimates the new labels will reduce the number of smokers by 213,000 in 2013, with smaller additional reductions through 2031.

The World Health Organization said in a survey done in countries with graphic warning labels that a majority of smokers noticed the warnings and more than 25 per cent said the warnings led them to consider quitting.

The legality of the new labels also is part of a pending federal lawsuit filed by Winston-Salem, N.C.-based Reynolds American Inc., parent company of America's second-largest cigarette maker, R.J. Reynolds; No. 3 cigarette maker, Greensboro, N.C.-based Lorillard Inc.; and others.

Tobacco makers in the lawsuit have argued the warnings would relegate the companies' brands to the bottom half of the cigarette packaging, making them "difficult, if not impossible, to see."

A spokesman for Richmond, Va.-based Altria Group Inc., parent company of the nation's largest cigarette maker, Philip Morris USA, said the company was looking at the final labels but would not comment further.