A charity is working with groups in Bristol and the police to raise awareness over the use of 'nos'. The substance - commonly known as laughing gas - has become more popular with 16-24 year olds, who use it for recreational purposes.
The sight of the small discarded metal cylinders have become a common sight along the streets of Bristol.
International Islamic charity Dawat-e-Islami launched a national campaign to raise awareness of the potential dangers of taking nos. It has been using Friday mosque services to engage with people about the drug.
