i dont think it would be dumping fuel when its not under load. i could see blowing some fuel related smoke under load and heavy acceleration. but if its blowing smoke at idle, its either head gasket, valve stem seals, or worn rings/bore.

almost all of those options are bad and will require work

if i were you id pass on the deal
there are other civics around
and u will regret getting ****ed if thats the case

~kris