I looked into this, and apparently you can not even buy and smoke them entirely outside of the US! You are not allowed to "benefit" from Cuban goods.
See
http://cigars.about.com/od/cubantrad...t/0062002a.htm
I looked at the government site, and it does confirm this. I don't remember that link.
If it were not illegal to do so, I would tell you that the Cuban cigar I would have had in Florence was fantastic.