Despite that being the general perception, it isn't actually the case.
Rates of abstaining from alcohol in Ireland are relatively consistent across numerous studies conducted during different years. WHO Global Health Observatory data shows that the proportion of adults (aged 15+) who have not consumed any alcohol during the past 12 months, assessed a given point in time, was 18.7% in Ireland in 2016 (10.5% male, 26.9% female). The percentage of lifetime abstainers in Ireland in 2016 was 7.4% (3.5% male, 11.2% female). While there were 11.4% former drinkers in 2016 (7% male, 15.7% female).
Data from the Drinkaware Index (2019) found that 23% of adults (18+) never consume alcohol. While high levels of binge drinking among under-25s were reported, 23% of this age group also reported that they do not consume alcohol at all. This corroborates the 25% who reported not consuming alcohol in the 12 months prior to the Healthy Ireland Survey 2018.
Data on abstention in the WHO European region identified 59.9% current drinkers, 6.6% former drinkers and 23.5% lifetime abstainers in 2016.
https://www.drinkaware.ie/research/alcohol-consumption-in-ireland/?a=alcohol-abstinence-in-ireland
Interesting stuff, thanks!