Hi, dr rodriguez:  Iodine is a poison but I eat it every day.  Caffine, nicotine, cocaine, opium, mercury, lead, coumaphos, etc.  all can be tolerated up to a point,   What we need to do is to keep consumption below - well below! - the threshold of injury, considering also threats of combinations.   Zero is not required.   Insisting on zero denies us  many useful materials.   Dan


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