Smith wrote his first horror book, Werewolf by Moonlight in 1974. It spawned two direct sequels. He is probably best known for a series of six Crabs books, the first of which, Night of the Crabs, was published in 1976. The series chronicles invasions by giant, man-eating crabs of various areas of British coastline. In 1980 a film adaptation Island Claws came out.
Smith has had over a thousand short stories and magazine articles published. He has written a series of children's books under the pseudonym Jonathon Guy, two thrillers under the name Gavin Newman and a dozen non-fiction books on countryside matters. However, he is best known for his 70 or so horror books. The Penguin Enclopedia of Horror and the Supernatural considers that Smith's horror novels were "endearing, imbued with lively storytelling and the tacky brilliance of the horror and science fiction cinema of the 1950's". On the other hand, the horror critic R.S. Hadji included Smith's novel The Sucking Pit on his list of the worst horror novels ever written. 
Smith's work mixes sex, violence, gore and self-conscious humour. Despite his reputation in some quarters as being a hack writer, Smith's novels enjoyed considerable popularity in Poland in the early 1990s, having been cheaply translated and published as pocket editions by the Amber publishing house.
A lifelong pipe smoker, he won the British pipe smoking championship in 2003. He collects pipes and smoking ephemera and has also written a book on tobacco - Tobacco Culture: A DIY Guide . He is also an active pro-smoking campaigner. He is married to Jean and they have four adult children.
Dead Meat (1996) (omnibus of all 4 books plus two new Sabat stories, Vampire Village and Hellbeat)
Thirst II: The Plague (1987)
The Sucking Pit (1975)
The Walking Dead (1984)
Writing as Jonathan Guy
Badger Island (1993)
Rak: The Story of an Urban Fox (1994)
Writing as Gavin Newman
The Hangman (1994)
An Unholy Way to Die (1999)
Novelizations of the classic Disney films. Paperback novels all originally published by New English Library in 1975 and reprinted by Pyramid Books in 1976 both with black and white drawings throughout.