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I'd be okay with disabling my ability to smell entirely. Smell seems to be a sense that is almost entirely used only for unpleasant or irrelevant things. Sure, food wouldn't taste as good, but it wouldn't hurt me to eat less anyway...

The less anything smells, the better.

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I know people who cannot smell (anymore) and they are not happy with it at all. Be careful for what you wish. :-)

For example, smell can alert you (of gas, of glycerin vs. water in a can, food burning during cooking, etc.). Further, it's not only that food doesn't taste as good, you either have to force yourself to eat (enough), or you eat too much, because the experience is more shallow than you were used too and you try to compensate.

Smell is a safety feature. It helps you avoid rotting food, rotting bodies, things contaminated with feces, unexpected chemicals, smoke and fire conditions.

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