If you get a bad cold you can knock off your smell for a while. Alternatively, as you mentioned, head trauma should be sufficient to pull all the delicate little nerves off the olfactory bulbs and stop you smelling.
However, I reckon weight loss is a lot better/longer term etc if you do it by exercise!
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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