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Medical professionals are reporting an increase in the number of young people being treated for the often long-term effects of using nitrous oxide recreationally.

Millie Lane from Stratford-Upon-Avon tried to save her friend who died after inhaling the gas. She tells her story to ÃÛÑ¿´«Ã½ CWR's Phil Upton.

This story contains references to drug use.