I have a cast iron skillet that's a hand-me-down from my husband's grandmother, and I've probably never properly taken care of it. I do use soap, and I think I've only seasoned it once, and even with that I'm not sure if I did it correctly.
Anyways, I never really had issue with it until recently when I heat it up it starts smoking a ton and it smells like horrible chemicals. Does anyone know what this means, and why it smells like chemicals? Do I need to start over and season it? Also, since we got it, the inner surface has never been smooth, it has some, for lack of a better description, raised areas that I've never been able to get rid of (photo attached). Any ideas on what I can do to make this workable?