It's worth repeating from my reply to a different post:
Laughing gas, also known as Nitrous Oxide, is a prescription drug in every state in the union. It should only be used by trained professionals due to the fact that its abuse can result in lethal consequences from Hypoxia caused by reduced Oxygen intake.
Nitrous Oxide also inactivates vitamin B12 from the body and its chronic use can result in Pernicious Anemia.
Some of the symptoms of Pernicious Anemia (low Vitamin B12) are:
Fatigue, changes in blood pressure, rapid heart rate, pallor, depression, muscle weakness, shortness of breath, difficulty in proprioception (body awareness), cognitive impairment (difficulty concentrating and sluggish responses aka cognitive dysfunction or brain fog), frequent diarrhea, Parenthesia (pins and needles sensations or numbness in fingers or toes), Jaundice (impaired formation of blood cells), Glossitis (swollen red tongue), damage to the thyroid, personality or memory changes, and Neuropathic pain.
I am not providing medical advice and this is for informational pruposes only.
Always play safe. Never play with Nitrous Oxide.