along with 15 other European nations adopted the Euro as their national currencies on 01 January 1999.
The lire was not valid as legal tender in Italy from that date but holders of the currency could bring the lire to banks an exchange for euros for some period of time after that.
With the possible meltdown of several economies in Europe, some of these Euro nations are facing the possibility of leaving the Euro and reverting to their old national currencies. I can only imagine what a nightmare that would be. Europe had years to prepare for the conversion to the Euro including everything from retrofitting ATMs, coin and bill-operated vending machines, cash drawers, etc. If this all happened overnight the chaos would be palpable and, as many have predicted, would throw not on the European economy, but the world economy into another recession.
Don't worry about what your neighbors think of you because they seldom do (think that is)!