User blog comment:AokijiSencho/Theory on Chopper and Luffy/@comment-1595565-20140709170934/@comment-4117216-20140710011556

Yeah I guess it wouldn't be an "illness" with a "cure", however it's possible for chopper to create some medicine or somebody to find some way to prolong someone's life. It could very well be a devil fruit! Yomi-Yomi no Mi xD