In addition to the finite supply (if everyone does it, there is no wood left) and wildfire risk (if you light a fire, you are morally responsible for EVERY spark and ember created, including the ones you don't see) issues, there is another one.

I know that in Europe, most land that isn't heavily settled or farmed is public land (Not all, just most), and you don't have our drug problem (I refuse to debate who's method is stupider). As a result, you don't get an issue we have in my area, which is tresspassers who are doing more than just burning wood. Private land owners who see campfires that they didn't know about get a little crazy- it's often a sign of someone putting in a marijuna patch on your land, or that they have packed in a miniature meth lab. Either of which could cost the landowner, who had nothing to do with it, thier property. At the very least, if the land holder calls it in, you get cops showing up with the fire department. And it doesn't have to be the land holder, just someone driving by who spots the fire and is being a good neighbor.

Pharaoh, maybe your idea of a good time is having a knee in your back and your face in the dirt while you are cuffed and dragged like a sack through the woods, but I'll pass.