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In the United Kingdom, nitrous oxide is the second most used drug among 16-24 year olds and it has already claimed 36 lives. PHOTO : Radio-Canada / Alexis Gacon

In the medical world, nitrous oxide is a gas used as an analgesic or anesthetic. For some, however, it is a recreational drug, the use of which is poorly documented in Canada. Alexis Gacon has met users of this laughing gas. Reporting.