This subject came up in this thread and rather than hijacking it any further, I’m opening a new thread.
I am curious about how widely spread this belief is. In case you aren’t familiar with it, in parts of Europe (maybe just SE/E Europe?) there is a belief that cross-breezes will make you sick. My only personal experience with this belief is in Bulgaria, where it’s called techenie. You can open a door, or you can open a window, but if you open them BOTH (even on a hot day), you have techenie and will become sick. This is not a superstition, it is a genuinely held belief by people of all ages.
Is this ringing any bells with you?