Spider-Man by Stan and me valid created work, our creation?" Kirby noted in a 1971 interview that it was Ditko who "got Spider-Man to roll, and the thing caught on because of what he did". Lee, while claiming credit for the initial idea, has acknowledged Ditko's role, stating, "If Steve wants to be called co-creator, I think he deserves [it]". He has further commented that Ditko's costume design was key to the character's success; since the costume completely covers Spider-Man's body, people of all races could visualize themselves inside the costume and thus more easily identify with the character. Commercial success A few months after Spider-Man's introduction, publisher Goodman reviewed the sales figures for that issue and was shocked to find it was one of the nascent Marvel's highest-selling comics. A solo ongoing series followed, beginning with The Amazing Spider-Man #1 (cover-dated March 1963). The title eventually became Marvel's top-selling series with the character swiftly becoming a cultural icon; a 1965 Esquire poll of college campuses found that college students ranked Spider-Man and fellow Marvel hero the Hulk alongside Bob Dylan and Che Guevara as their favorite revolutionary icons. One interviewee selected Spider-Man because he was "beset by woes, money problems, and the question of existence. In short, he is one of us." Following Ditko's departure after issue #38 (July 1966), John Romita Sr. replaced him as penciller and would draw the series for the next several years. In 1968, Romita would also draw the character's extra-length stories in the comics magazine The Spectacular Spider-Man, a proto-graphic novel designed to appeal to older readers. It only lasted for two issues, but it represented the first Spider-Man spin-off publication, aside from the original series' summer Annuals that began in 1964. An early 1970s Spider-Man story ultimately led to the revision of the Comics Code. Previously, the Code forbade the depiction of the use of illegal drugs, even negatively. However, in 1970, the Nixon administration's Department of Health, Education, and Welfare asked Stan Lee to publish an anti-drug message in one of Marvel's top-selling titles. Lee chose the top-selling The Amazing Spider-Man; issues #96–98 (May–July 1971) feature a story arc depicting the negative effects of drug use. In the story, Peter Parker's friend Harry Osborn becomes addicted to pills. When Spider-Man fights the Green Goblin (Norman Osborn, Harry's father), Spider-Man defeats him by revealing Harry's drug addiction. While the story had a