Obviously that's unenforceable and thus pointless, unless you merely want to be a chat board killjoy. But what makes you think that's actually true?
Cuban Assets Control RegulationThe question is often asked whether United States citizens
or permanent resident aliens of the United States may
legally purchase Cuban origin goods, including tobacco and
alcohol products, in a third country for personal use
outside the United States. The answer is no. The
Regulations prohibit persons subject to the jurisdiction of
the United States from purchasing, transporting, importing,
or otherwise dealing in or engaging in any transactions
with respect to any merchandise outside the United States
if such merchandise (1) is of Cuban origin; or (2) is or
has been located in or transported from or through Cuba; or
(3) is made or derived in whole or in part of any article
which is the growth, produce or manufacture of Cuba. Thus,
in the case of cigars, the prohibition extends to cigars
manufactured in Cuba and sold in a third country and to
cigars manufactured in a third country from tobacco grown
in Cuba.
