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There are around one billion smokers in the world, about a seventh of the global population, according to World Health Organization (WHO) and other estimates.

China has the highest number: of its population of 1.3 billion, about 315 million are smokers and they consume more than a third of the world's cigarettes, the WHO said in a report last year.

Indonesia has the highest proportion of smokers at 76 percent of men aged over 15.