We’ve been asking Newstalk listeners what the 20 Most Influential Moments of The Last 20 Years are… Selected so far has been Brexit, the election of Barack Obama, the Queen's Visit, Saipan and water charges. Today we're looking back on the introduction of the Smoking Ban in 2004. Dr. Patrick Doorly, Chair of the Ash Council of the Irish Heart Foundation tells Shane Coleman why the smoking ban has been so effective On The Pat Kenny Show, reporter Josh Crosbie investigates what effect the smoking ban has had on  the hospitality industry Sean Moncrieff delves deep in the history of smoking with American author Sarah Milov And Kieran Cuddihy talks to one of the key players who worked to get the smoking ban introduced, Taoiseach and former Health Minister Micheál Martin   Check out newstalk.com/20moments for more   Listen and subscribe to 'The 20 Most Influential Moments of The Last 20 Years' on Apple Podcasts, Google Podcasts and Spotify.   Download, listen and subscribe on the Newstalk App.   You can also listen to Newstalk live on newstalk.com or on Alexa, by adding the Newstalk skill and asking: 'Alexa, play Newstalk'.