A smoking ban has been introduced for enclosed public places in Northern Ireland.
The ban covers areas such as workplaces, pubs, clubs, restaurants, shopping centres and social clubs.
The BBC Northern Ireland news website has put together online resources which offer advice, information and background on the ban.
SPACE TO BREATHE NORTHERN IRELAND
The Department of Health has produced a website detailing how the ban will work for employers and businesses, as well as support and advice on how to stop smoking.
The law which prohibits smoking in enclosed public places and workplaces can be read on the Department of Health website.
The Freedom Organisation for the Right to Enjoy Smoking Tobacco (Forest) backs smoke-free areas in pubs, clubs and restaurants but opposes a total ban.
Action on Smoking and Health (Ash) is a voluntary organisation which campaigns for tobacco control legislation.
FEDERATION OF RETAIL LICENSED TRADE
The federation represents about 1,100 pubs, hotels and restaurants across Northern Ireland.
CHARTERED INSTITUTE OF ENVIRONMENTAL HEALTH
The institute has trained more than 140 council officers across Northern Ireland in how to enforce the smoking ban.
NI CHEST, HEART AND STROKE
The association works to promote the prevention of and alleviate the suffering resulting from chest heart and stroke related illnesses.
BBC STOP SMOKING TIPS
Some useful advice outlining the dangers of smoking and methods to help you kick the habit.
HEALTH PROMOTION AGENCY FOR NI
The agency promotes healthy living in Northern Ireland, co-ordinating a range of public awareness campaigns and conducting research.
ULSTER CANCER FOUNDATION
The charity helps local patients and their families cope with cancer. Its website also has information on cancer prevention measures.
Action Cancer provides a range of services, including counselling and support, early detection clinics, research and health promotion.