 His run started with " Dangerous Habits " ( 41 @-@ 46 ) , which was the basis for the 2005 film Constantine , and dealt with John Constantine contracting lung cancer , and the desperate deal he makes with the First of the Fallen , and various other lords of Hell , to save himself . In the course of trying to save himself , he visits Ireland , where he becomes <unk> with Kit Ryan , an old friend . The following few issues follow the early stages of his relationship with Kit , a plot to install a demon on the British throne in the plotline " Royal Blood " , and in the extended issue # 50 , his first meeting with the King of the <unk> . One minor story in this arc ( issue # 51 ) was written by guest writer John Smith . 
