Poland should not adopt euro. It will follow the destiny of the Southern European countries. The de-industrialisation processes hit the Southern European countries as soon as they adopted euro. They lost their competitiveness to Germany. Italy, once a powerful industrial country, lost its power.
Recurring pro-Kremlin narrative demonising the EU, the Eurozone and claiming that euro is responsible for the economic downfall of many European countries. Read a recent similar case here.
The Eurozone shows a GDP growth of 2.4% as of 2017 according to the World Bank and a real GDP growth of 1.3% in accordance with IMF data. In April 2019, the International Monetary Fund indicates the real GDP growth of the countries who have recently adopted euro the following way: 3.2 % for Estonia, 3.3% for Latvia, 2.9% for Lithuania and 4.1% for Slovakia. Eurostat data also reveals predominately stable GDP growth in Estonia, Latvia, Lithuania and Slovakia since the last global crisis of 2008.
Poland has been a champion in the economic growth in Europe and benefited a lot from its membership in the EU in recent years. These two factors form a positive forecast for is future as a part of the European Union and also the Eurozone.
The reasons for the economic problems listed by the IMF in their recent report show no connection with the euro adoption in Italy.