Police are warning people against inhaling a potentially deadly gas.
Gwent Police says it has had reports of young people inhaling gas from nitrous oxide canisters in the Caerphilly area.
The so called 'laughing gas', when inhaled, can lead to a feeling of euphoria, being relaxed as well as hallucinations and dizziness.
Using the gas in this way can also lead to an increased risk of death.
