I toured cave sights in Serbia a long time ago, this
>>2636646 is entirely true, fires destroy caves.
In fact the best way of making a cave is probably to light a fire against a rock face, and use clay to protect the roof.
And my travels across eurasia, Spain and Italy have convinced me that these people were simply building houses inside caves, they didn't live "in a cave".
If I was living in a cave the first thing I'd do is to put wooden bars over the entrance and build a stone wall over the lower half, so everyone going in and out would have to go up a little ramp.
Then I'd build what would effectively by a rocket stove going from the back of the cave to the front, the lower half you would sleep on and the upper half would be a drying rack, the very end would be a smoking chamber.
Then I'd pack down a dirt floor, while less clean it would have an even slope outwards to carry cold air away.
Then you would put in shelves by drilling holes, putting in posts then using wicker and daub to form the shelf.
You'd probably have a quern but you could then build a mill. What else are you going to do at night but mill grain and work fibre?
Basically where you've removed the rock you would end up rebuilding, and thus you quickly see why caves were abandoned. Diminishing returns on space. Very quickly it makes more sense to build free standing wooden, rammed earth, stone or brick structures
