Also referred to as nos , users breathe in laughing gas through balloons or cannisters - which cost just £25 for industrial-sized containers - causing a feeling of euphoria, relaxation and dissociation
Huge Dutch hippy crack canisters filled with 80 times more nitrous oxide than normal cylinders have lined the streets of Notting Hill as a major clean-up operation gets under way
Nitrous oxide is regularly taken by young people at parties and festivals, and the small silver canisters it is usually sold in have become a familiar sight in town centres and parks.