How does laughing gas (N₂O) work?

Question

Laughing gas (N₂O), well, makes people laugh. How does just a gas make us do that, there has to be some hormones at work...So, I wanted to know how this works? What is the mechanism?

Answer 1

From the Internet:

 When nitrous oxide is inhaled, the gas enters the blood stream through the lungs and travels quickly to the brain, where it triggers the release of the body's natural opioids, endorphins and dopamine