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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