I already looked into this myself my friend and unfortunately soon discovered that the taxes, duty and shipping costs mean you end up needing to sell the cigars for pretty much what your local Supermarket does. Sure you can boast better cigars and a better range, but there are already a number of firms doing this that likely will be selling for less than you because of the bulk buying that do, but even their profits will be tight.
It's a a real shame, because the actual cost of the cigars in the USA is really cheap compared to what they cost over here.