Thirty-day smoking prevalence (%) in Irish European School Survey Project on Alcohol and Other Drugs Surveys (ESPAD) from 1995 to 2015
| Year | 1995 | 1999 | 2003 | 2007 | 2011 | 2015 |
| Male | 36.7 | 32 | 28 | 19.3 | 18.6 | 13.1 |
| Female | 44.9 | 42 | 37 | 26.8 | 23.2 | 12.8 |
| Total | 40.9 | 37 | 33 | 23.4 | 20.9 | 13.0 |
| P values* | <0.001 | <0.001 | <0.001 | <0.001 | 0.009 | 0.83 |
*The null hypothesis is that female and male students had the same smoking prevalence.