Her first appearances on national radio were on Radio 5's "The Treatment" in 1997. She was subsequently a regular panellist on "The News Quiz" and "Just a Minute" and appeared frequently on "I'm Sorry I Haven't a Clue" (from June 2001 onwards), "Have I Got News for You", "Mock the Week", "Countdown" and "QI". She wrote and starred in her own Radio 4 sitcom, "Linda Smith's A Brief History of Timewasting". After appearing on Radio 4's "Devout Sceptics" to discuss her beliefs she was asked by the British Humanist Association (BHA) to become president of the society, a role that she occupied with commitment from 2004 until her death. In 2002, she was voted 'Wittiest Living Person' by listeners to BBC Radio 4's "Word of Mouth". In his 2003 book Classic Radio Comedy, Mat Coward called Smith "the funniest woman on radio today".