But drachma defenders contend that these worst fears are overdone. Yes, there would be disruption and panic initially. But, they say, pointing to Argentina’s case when it broke its peg with the dollar in 2002, the export boom ignited by a cheaper currency and the ability to control the drachma would eventually work in Greece’s favor.

“The real problem is that we are operating under a foreign currency,” Vasilis Serafeimakis, a senior executive at Avinoil, one of Greece’s largest oil and gas distribution companies, said of the euro. In the last year, he has been banging the bring-back-the-drachma drum.

“If we had our own currency, we could at least print money,” Mr. Serafeimakis said, referring to the ability to revalue the drachma. “And what is the worst thing that happens if we do this? I don’t get a Christmas gift from one of my bankers.”

His voice is still a lonely one.

According to a recent poll in the Greek newspaper Kathimerini, 66 percent of Greeks believe that returning to the drachma would be bad. But proponents of a euro exit say that beneath the surface, more Greeks are beginning to question the euro.

“The view that Greece should exit the euro is more widespread than you would think,” said Costas Lapavitsas, a Greek economist at the University of London who has long pressed for a return to the drachma. “It is just that the opposing view is so dominant.”