If You Had A Twin, But Didn't Realise...
Family Life1 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.One idea might be that, in certain cultures, people would feign a sneeze as an indication of disbelief or suspicion if they thought someone was telling a tall story.
In the classical piece "Lieutenant Kije" by Zoltan Kodaly, Kije is reknowned for his exaggerations and there is a very brief movement (a matter of seconds) which represents a huge sneeze from the assembled company.
I suspect, therefore, that if something is "not to be sneezed at" it should be deemed reliable and/or believable. Though, now I'm writing this, I realise it's often used when talking about larger sums of money. Maybe that's to do with the exaggeration part...