Not according to this article on the US customs website: http://www.customs.gov/xp/cgov/trave...ban_cigars.xml. The basic gist of the article follows:

It is also illegal for U.S. persons to buy, sell, trade, or otherwise engage in transactions involving illegally-imported Cuban cigars. The penalties for doing so include, in addition to confiscation of the cigars, civil fines of up to $55,000 per violation and in appropriate cases, criminal prosecution which may result in higher fines and/or imprisonment
I copied the article and linked to it on the policy thread: http://www.cigarsmokers.com/t494-off...an-cigars.html