I remember a buffet place—it may have been a Golden Corral, not sure—that had a sealed off smoking section with a glass wall, one of those “air doors” above the sliding door that function like an air lock, and a separate AC system.

It was always weird to look into that space and watch the lonely people smoking and eating.

Every other restaurant was a smoking free-for-all.

To be fair, the schisms have been occurring for like 200 years.

In a similar vein is A Canticle for Liebowitz which is about an order of Monks whose goal is to preserve all technology and information after an apocalypse scenario. I think it may have been the inspiration for the Brotherhood of Steel.

It moves through time and shows how ignorance of technology can mix too easily with religious power.