The supply of nitrous oxide gas is allowed for culinary uses. However, it can also be misused by some people as a recreational drug. Misuse of nitrous oxide is highly discouraged due to the health effects.
When inhaled directly, a nang provides an intense feeling of euphoria and lightheadedness (feel giddy, dizzy, relaxed, and giggly, sometimes results in fits of laughter).
There are some harms associated with misuse.  Inhalation of nitrous oxide causes short-term decreases in mental performance, audiovisual ability, manual dexterity and spatial and temporal disorientation. These effects could result in physical harm such as falling etc…
The inhalation of nitrous oxide gas has been shown to have harmful side effects in humans such as blurred vision and peripheral neuropathy. Inhaling nitrous oxide reduces the body’s ability to absorb vitamin B12 and result in a vitamin B12 deficiency  (long-term depletion causes memory loss, brain and nerve damage) .
Death from the misuse of nitrous oxide is uncommon but sudden death can happen if a person asphyxiates themselves due to lack of oxygen. For more information on misuse or other drug and alcohol issues please see the alcohol and drug foundation or consult a medical professional. They can provide releant information on aspects such as harm reduction.