Cult music group Man or Astroman? took their name from a line in the film's trailer.
When August Ragone worked at MGM, he pulled the files for both The Human Vapor and Gorath (another Brenco release) and, though they had been acquired long before May 1964, there was no indication, at least in the files, that they had been exhibited before that. MGM still owns 35mm elements Brenco used for their heavily bastardized edited versions of those films, but as he recall they were all in extremely poor condition.
The Human Vapour was distributed in Japan by Toho on December 11, 1960. The film was later released in the United States as The Human Vapor by Brenco Pictures with an English-language dub May 20, 1964. The film was a double feature with Gorath and edited down to 79 minutes.