I think 're screwed if so, lol
Eucalyptus oil will contain terpenes that are very similar to terpenes found in hash, maybe even some of the same terpenes. And these terpenes will be most probably soluble in things like alcohol or non-polars but not soluble in water.
But hey, if its just eucalyptus oil, probably not so bad
.. If it's some ghee butter or whatever else, probably worse to smoke it.
Vaporize it instead of smoking it, probably helps remove some nasties in case its something other than essential oil.