Table salt is mined, and then more importantly, refined to its (almost) pure form.
Sea Salt (which I will admit tastes better) is evaporated sea water. Here lies the problem. . . EVERYTHING that was in the sea water is still gonna be in the salt (that was able to dissolve and not be filtered). All the chemicals, urine, bacteria, etc. it is all still there.
No, it doesn't matter where in the ocean it came from. To the poster who said he got his imported; what is wrong with you? You're paying twice as much, but instead of getting salt from polluted american water, you are getting it from the polluted water in the Med (which is far worse, as pollution goes)?!?!
Fortunately for me, I don't care much about my health, and would rather live life. If sea salt is handy, I will use it over table salt. if it isn't, I won't spend the extra money to buy it.
btw, I live on top of a HUGE salt mine. The entire city of Detroit is over one, that is still a working salt mine.