More than 80 percent of smallpox vaccines the government has stockpiled to guard against possible bioterror attacks are either expired or unfit for human consumption, a government report showed Wednesday. Of the total 7 million doses the government has bought since 2002, some 4.59 million doses, or 65.6 percent, have expired, while 1.06 million doses, or 15 percent, failed standard toxicity tests conducted in July, meaning they are too toxic to inoculate people, according to the report by the Korea Food & Drug Administration (KFDA).