Milagros Diaz has been rolling cigars for 48 years, so long she cannot even smell tobacco anymore, and she is thrilled that the U.S. market is finally opening up for her handmade Cuban “habanos”. Since U.S. President Obama announced on Wednesday he would restore diplomatic ties with Cuba and start dismantling economic sanctions, Americans have been filing into the cigar shop at the Hotel Nacional in Havana, where she hand-rolls cigars using techniques little changed since the 19th century.