BackgroundThe Smoking (Northern Ireland) Order 2006, which makes it illegal to smoke in most enclosed workplaces and public places, was set up to protect workers and the public from second-hand smoke.
Inhaling other people's smoke increases your risk of lung cancer, heart disease and strokes, as well as other health problems.
Between December 2004 and March 2005, a major public consultation about smoking, undertaken by the government, received more than 70,000 responses.
More than 90 per cent of respondents said they would support smoke-free legislation, paving the way for the law's introduction in April 2007.
You can find out more about passive smoking from the NHS Choices website