Comment by soulofmischief

This is easily falsified by a cursory internet search about the physiological mechanism behind nitrous oxide's effects. It is appalling that a medical professional would so confidently give you an uneducated, crackpot answer. The exact same mechanism which knocks you out gives you euphoria at lower doses.

If someone holds their breath long enough to cause hypoxia when inhaling nitrous oxide, they have other problems. You can easily hold your breath 1-2 minutes while sitting on a couch without experiencing hypoxia. If you're experiencing euphoria as strong as what nitrous oxide causes from hypoxia, you're basically about to die.