Nitrous Oxide

Nitrous oxide is a colorless gas with a sweetish odor, prepared by heating ammonium nitrate. It produces exhilaration or anesthesia when inhaled and is used as an anesthetic and as an aerosol propellant.
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It is inhaled through the mouth or nose. Some slang names are NOS, laughing gas, whippets, hippie crack, buzz bomb, huff, bolt, locker room, popper and snapper.

Some short term effects are nausea, loss of motor control, you could pass out and fall, and coldness in throat which can lead to suffocation and damage to vocal cords. Some long term effects are bone marrow damage, disruption of nervous system, and you could suffocate and die.

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Someone may be using nitrous oxide if they have frequent nose-bleeds, constantly have a chemical odor, appear to be drunk, have lost their sense of smell, or are disoriented. Other warning signs may be a malfunctioning air-conditioner, or an abundance of filled aerosol cans that don’t spray. When tolerance to inhalants develops users have to take deeper breaths of stronger chemicals to achieve the same “high” sensation. Withdrawal symptoms can include irritability and behavioral changes such as loss of appetite, or disinterest in friends, family, and daily activities.

Little Shop of Horrors - Now (It's Just the Gas)
In this song, the character singing is a crazed dentist who has gotten a nitrous oxide mask stuck on his face in an attempt to use the laughing gas for himself and not for his dental patients. (2:36-3:04)
Unless taken with at least 20% oxygen, hypoxia (decreased oxygen content of the blood), can be induced. If the concentrations are mixed with room air, inhaled O2 concentrations drop to low levels and the hypoxia may result in irreversible brain damage. When taken directly from the tank, there is a risk of damaging your lungs. Most deaths from nitrous oxide occur when the user passes out unconscious and hits his or her head on the ground.