As a group of the UK's top medical professionals call for a ban on smoking in public places, we take a look at other parts of the world that have tried to do the same, with varying results.
Abhishek Prabhat, BBC Delhi
Smoking in public places is banned in Delhi and a lot of other parts of India but it hasn't made any difference. This is because the ban has never really been implemented - there are meant to be fines if you are caught smoking in restaurants, railway stations and public buildings, but to my knowledge no-one has ever been caught or fined.
An estimated 1m people die every year in India from tobacco-related causes and majority public opinion was behind the ban but it was passed without anyone really considering how it would be enforced.
Lack of money and resources has meant it has had no impact in India and is openly flouted.
James Helm, BBC Dublin correspondent
In Ireland, you hear a lot about this country's so-called "pub culture". So it's only natural that such a radical change to the atmosphere in pubs, as proposed by the smoking ban, is the cause of much lively bar-room debate and a few concerns.
Publicans groups warn that the ban, due to be introduced by the end of February 2004, could mean smokers staying out of bars, and the net result being job losses. But there are others who believe that thick, smoky air is one ingredient of the traditional Irish pub that customers can do without.
As for the drinkers, they are split between those who object to what they see as their right to a cigarette with a pint being taken away, and others who welcome the change.
The Government says the smoking ban is a public health issue; opponents say it's all about civil rights. Either way, a ban on smoking in the workplace - and that will include pubs and restaurants - is close to becoming a reality in Ireland.
Karen Allen, BBC health correspondent in Norway
Norway is due to bring a national ban on smoking in restaurants, bars and cafes next summer. This is some consolation for smokers who will have to take their habit outside and puff away in temperatures of minus 20 degrees during the harsh Scandinavian winters.
The aim of the ban is not only to protect staff that work in these establishments from the harmful effects of passive smoking, but also to "de-normalise" smoking as a social pastime. One in three people in Norway smoke, and there has been a rise in tobacco-related deaths.
A packet of cigarettes costs about £6 in Norway - but people can still afford to smoke, as the country has the highest per capita income in the world.
Rachel Clarke, BBC news online Washington, USA
In the United States, there are no nationwide laws banning smoking, but various states, counties and cities have taken the often controversial initiative.
California and Delaware, for instance, have banned smoking in enclosed workplaces, including restaurants and bars, while Utah prohibits smoking in restaurants.
Emphasis is often placed on protecting the health of employees.
The laws arouse passions on both sides, with some bar owners saying their businesses are being destroyed, smokers saying their rights are being infringed and non-smokers delighting in a fresher environment.
Maryland's Montgomery County neighbouring Washington DC became one of the latest municipalities including Honolulu in Hawaii, Helena in Montana, New York City and El Paso in Texas to introduce public smoking restrictions. Diners and drinkers now have to go outside should they wish to smoke a cigarette.