Many people do not. Around the world, it’s estimated that 2billion people have an iodine deficiency; in Canada it’s apparently ~12%. I just checked the U.S. figure, 17% of US adults, and it has increased by 50% since late 1970s because of changes in nutrition and food production (link [here](https://link.springer.com/article/10.1007/s12011-018-1606-5). People are honestly stupid and forgetting the horrors nutritional deficits used to cause, just like they forget the horrors of preventable diseases like measles. Just as FYI, in many much poorer countries like Serbia it is illegal to sell non-iodized salt in retail (it can only be sold for industrial uses).
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