Although smoking is becoming less popular in many parts of the world, the total number of smokers is growing, global figures reveal.
In 2012, 967 million people smoked every day compared with 721 million in 1980, data from 187 countries shows.
The rise is linked to population growth, researchers told JAMA.
With the Earth's population having more than doubled in the last 50 years to seven billion, there are simply more people to take up the habit.
Several large countries, including Bangladesh, China and Russia, have seen increasing numbers of inhabitants take up smoking in recent years, the figures show.
Indeed, some of the highest smoking rates are now seen in the developing world, according to the JAMA report from the University of Washington's Institute for Health Metrics and Evaluation (IHME) in the US.
But global smoking prevalence - the proportion of the world's population that smokes - has gone down.
Around three in 10 men (31%) and one in 20 women (6%) now smoke daily compared with four in 10 men (41%) and one in 10 women (10%) in 1980.
In terms of countries with the highest prevalence of tobacco use, East Timor tops the list with 61% of its population smoking every day.
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