Out of curiosity, why would you burn your trash, and especially plastics? It smells and is clearly unhealthy and the caloric content is worthless compared to wood.
Several garages near my house have people living in them, and they burn anything that burns -- plastic bottles, pieces of used tires, rags soaked in used motor oil. I'm pissed as hell at them, but the country is already poor, and they have even less.
Old/low quality stoves leak a lot of emissions in the house, but people don't realize it. Also, smoke finds its way back in the house quite easily. Sad that such extreme tragedy of the commons still happens.
(I'm not from Poland.)