[7] Formerly manufacturing in London and Dublin, Gallaher moved production to Belfast (cigarettes) and Wales (cigars) in the early 20th century.

[11] In 2002 US tobacco firm Reynolds formed Reynolds-Gallaher International to access cigarette sales in most countries in the European Union.

The agreement was scheduled to run through 2012 but in May 2007, as a result of the acquisition of Gallaher Group by Japan Tobacco, it was announced that this joint-venture would cease in November 2007.

[12] Japan Tobacco became the sole owner of the Gallaher Group on 18 April 2007, in the largest ever foreign acquisition in Japanese history.

[14] In 2015, JTI Gallaher announced the closure of their Ballymena operations with all work due to re-locate to Eastern Europe in a cost saving measure by 2017.

Gallaher-owned brands included Benson & Hedges (with Philip Morris International, British American Tobacco, and Japan Tobacco), Silk Cut, Sterling, Mayfair, Crystal, Nil, Kensitas Club, Senior Service, Dos Hermanos, Gold Seal, Amber Leaf, Sobranie, Hamlet Cigars, Logic (vape) and Nordic Spirit (nicotine pouch).