[B.T.]

I don't have any correct numbers, but I know, that in the EU a surprisingly high amount of tobacco was cultivated in the 90ies. Nowadays tobacco is not wanted anymore, but in the T2k timeline, there would have been the possibility, to grow tobacco. I can imagine, that on a local basis some farms or small settlements would raise tobacco in order to generate a valuable trading product. Certainly the growing of grains/cereals would be more important for a community, but on a limited scale I can imagine tobacco to give some additional income for farms.
From time to time ilegal cannabis plantations are discovered in Germany. Sometimes the police finds them and destroys them but, yes, in certain areas cannabis can be grown in Western Europe. I suppose, the same is true in Poland - just a guess.