No. In Poland, psilocybin and psilocin (the active compounds in magic mushrooms) are classified as Schedule I substances according to the Act on Counteracting Drug Addiction. This means that the possession, distribution, and production of mushrooms containing these substances is illegal and subject to criminal penalties. The law applies specifically to the fruiting bodies (the mushrooms themselves) that contain these psychoactive compounds. It's important to distinguish between the mushrooms containing psilocybin and the mycelium (the vegetative part of the fungus) which generally does not contain significant amounts of these compounds. This distinction is why growkits containing only mycelium can be legally sold in Poland. If you're interested in mycology for scientific or educational purposes, there are many legal mushroom species to study that do not contain controlled substances.