1 October 2007 .
It has been illegal for retailers to sell tobacco in all forms to people under the age of 18 in three of the UK 's four constituent countries ( England , Wales , Northern Ireland , and Scotland ) ( rising from 16 ) .
Since 1 October 2007 , it has been illegal for retailers to sell tobacco in all forms to people under the age of 18 in three of the UK 's four constituent countries ( England , Wales , Northern Ireland , and Scotland ) ( rising from 16 ) .