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It is called so because  inhalation of this gas causes euphoria,numbness .euphoria causes some little and laugh
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1. " N2O is also called the laughing gas because it makes us laugh and giggle a lot . "
2. once we inhale the N2O gas then this gas would make us laugh out loud hence it is called a laughing gas 
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hope so my answer is useful and mark as best if possible :D
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