Cast iron fan and newly converted carbon steel fan here. So much that we replaced a $1200 glass cooktop with a $1600 Viking gas cooktop and $250 for a new gas line.
Cracked one Lodge, older but not an antique, probably by thermal shock. It happens and a brand new identical replacement would be $20
No hot pans to cold water
Never use soap
I like the idea of sanding a newer one down first
If you do, and you will, ruin the seasoning, re-season it.
Oil smoking is good for seasoning but never for cooking.
Keep acidic stuff out, use stainless or non-stick
Nothing residential can get hot enough to hurt it.
Seasoning is an artform. When in doubt, wash it and re-season it.
Recent convert to flaxseed oil. After using basically everything from lard, bacon, olive, avacado, etc. oils, tbe flaxseed seems to just work.