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those vacuum lines being unplugged wont cause white smoke.
most likely you cracked a head or popped a head gasket about the same time you disconnected and plugged the lines.
pull your oil filler vap and look for the dreaded milkshake.
is it possible that it just cold where you live and your just getting a lot of condensation in the pipes?does it smoke all the time or does it stop after it warms up?