As E-cigaretters are the new rave I do not believe the federal government has made an overall ruling on this issue as of yet. Usually local Commanders (Installations Commanders) will address new issues like this in policy letters.
While we have nothing in writing at this time it is our understanding the E-cigarettes will not be allowed in federal buildings.
I would encourage you to seek a policy determination at your local local IG and/or JAG office.
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