Smith was a well-known broadcaster and early Australian screen personality. His most popular on-screen program was The Pied Piper, in which he conducted candid interviews with children. He also devised and wrote (with veteran radio writer George Foster) the scripts for the entire 13 episodes of Mrs. Finnegan, a television series, which appeared on ATN 7 (Sydney) from 1970 to 1971. He published the parenting book How to Get Closer to Your Children (1985) and two volumes of Supernatural!: Australian Encounters (1991 and 1993), about ghost sightings in Australia. He also wrote the social history work Australian Battlers Remember: The Great Depression (2003).
Volumes One and Two of Australian Children's Books by Marcie Muir and Kerry White (Melbourne: Melbourne University Press, 1992-2004) list numerous activity books for children authored by Smith between 1960 and 1982.