Reducing second-hand smoke (SHS) exposure has become a central component of tobacco control policies across the island of Ireland. The expansion of smoke-free spaces directly reduces exposure of children and adults and further denormalises tobacco use in a variety of social contexts. Challenges remain in terms of persistent health inequalities and significant exposure to SHS in the home, particularly in the context of children. This snapshot report presents a brief overview of progress on the development of smoke-free spaces on the island of Ireland. This snapshot updates on an earlier document published in June 2016.