>>13641351This is an incredibly oversimplified view of neuropharmacology. There are dozens of distinct serotonin receptors throughout your body all doing different and sometimes contradictory things. You likely don't even need to involve the serotonin system to accomplish what you're after.
If all you're looking for is a clean, quick mood lift without side effects, a low dose of xenon is what you want. It's incredibly expensive though so nitrous oxide is the next closest, but you can't use it too frequently because you'll develop a nasty B12 deficiency. Also, any time you inhale a gas you should make sure you're inhaling at least 20% oxygen.
