The ban, announced by health minister Michael McGimpsey back in June this year, came into force on 1 September. Shopkeepers in Northern Ireland are being warned not to sell cigarettes to anyone in school uniform. Paul Rafferty, environmental health officer at Derry City Council, said: "Most adult smokers become addicted to tobacco when they begin smoking in their early teens. It is hoped by making it more difficult for young children to buy cigarettes the new law will protect many of them from a lifetime of nicotine...