What causes large amounts of white smoke from exhaust on 93 Camry?

White smoke from a tailpipe is caused then coolant and oil are mixed together. Typically, this is caused by either a cracked block, cracked cylinder head, blown headgasket. Have engine diagnosed at a shop of your choice. It is not a cheap fix but driving like this for long periods of time will cause engine to overheat and cause more problems than you would like.