Nitrous oxide (or nitrogen oxide), N₂0, is a colourless and almost odourless gas that is used as an anaesthetic in dentistry, and recreationally for the stimulation and light-headedness it produces.
- Mild euphoria (often giggling)
- Head rush/light headedness
- Mood swings
- Excessive use can cause breathing difficulties and heart problems
The gas itself can’t be seen, but it is often found in small, pressurised canisters used in catering (whipped cream, etc.)
Most often a balloon is inflated using a canister and held closed, then the user will take a breath or gulp from it; one balloon may be passed around a group until it is empty.