Treat it right, and cast iron cookware will last you a lifetime. Literally. In fact, you really can't ruin it forever; it might take a little elbow grease and some patience, but there's always a way to bring it back to life. The real key to making cast iron stand the test of time (and cooking) is knowing the best ways to clean and maintain it.
How to smooth the rough cooking surface of a modern Lodge cast iron skil... ((Excellent method to sand/bake in oven and cleaning cycle/seasoning I have come across. He mentions a great tip I have not heard before. I WANT TO TRY THIS MYSELF!!!))