Baku, July 7 (AZERTAC). Anti-smoking measures have become so widespread that they now affect some 3.8 billion people - just over half the world`s population, the World Health Organization said Thursday.

But the WHO called for more action, warning that tobacco use could kill a billion people or more over the course of the 21st century "unless urgent action is taken."

"If current trends continue, by 2030 tobacco will kill more than eight million people worldwide each year, with 80 percent of these premature deaths among people living in low- and middle-income countries," it added.

The WHO Report on the Global Tobacco Epidemic was launched in Uruguay as the health body sought to highlight the country`s legislation against smoking that now faces a lawsuit by tobacco giant Philip Morris.

"The tobacco epidemic continues to expand because of ongoing tobacco industry marketing, population growth in countries where tobacco use is increasing, and the extreme addictiveness of tobacco that makes it difficult for people to stop smoking once they start," said Ala Alwan, WHO assistant director-general for noncommunicable diseases and mental health.

He noted that tobacco remains the biggest cause of preventable death worldwide, killing nearly six million people and costing hundreds of billions of dollars in economic damage each year.

Health warnings on cigarette packs protect more than a billion people in 19 countries, almost double the figures over the past two years, according to the report.

The size of the warning also has an effect, and the WHO noted that Uruguay had the largest images on cigarette packs, covering 80 percent of the surface, followed by Mexico (65 percent) and Mauritius (also 65 percent).

In Canada, the first country to introduce large health warnings on cigarette packs in 2001, three out of 10 former smokers said they were motivated to quit by the labels while a quarter said they helped them quit, according to the report.

Similar trends were also noted in Australia, Brazil, Singapore and Thailand.

Some 425 million people in 19 countries -- six percent of the world`s population -- are now "now fully protected against tobacco industry marketing tactics," 80 million more than in 2008, according to the WHO report.