Smith's most popular program was "The Pied Piper" (initially radio, later on television), in which he conducted candid interviews with children. He also devised and wrote (with veteran radio writer George Foster) the scripts for the 13 episodes of the television series "Mrs. Finnegan", which appeared on Sydney channel ATN 7 from 1970 to 1971.
He published the parenting book How to Get Closer to Your Children in 1985 and two volumes of Supernatural!: Australian Encounters in 1991 and 1993, about ghost sightings in Australia. He also wrote the social history work Australian Battlers Remember: The Great Depression, published in 2003.