Supposedly jockeys were particularly fond of the tapeworm treatment, but no medical record has been found to support this theory and given the many dangerous side effects of a tapeworm infestation it’s more likely than not that anybody using the worms would be visiting a hospital early and often.
Nevertheless, a 2009 episode of "The Tyra Banks Show" featured several guests who admitted they were still willing to eat worms in the pursuit of physical beauty.