southern's pre-eminence waned rapidly in the 1970s—his screen credits decreased, his book and story output dwindled, and he acquired a reputation as an out-of-control substance abuser. he continued to drink heavily and take various drugs; in particular, his dependence on dexamyl badly affected his health as he aged. biographer lee hill suggests that southern was a functioning alcoholic and that his image was largely based on his occasional public appearances in new york, partying and socializing; in private, he remained a tireless worker.