Nitrous Oxide (N₂O) - Laughing Gas. Do not experiment N₂O inhalation. What are the side effects of inhaling nitrous oxide? People often refer to nitrous oxide as laughing gas. Nitrous oxide slows down a person's reaction time and causes a feeling of euphoria. In these circumstances, a few of the most common side effects of nitrous oxide include: - dizziness, nausea, or vomiting. - fatigue. - headache. - excessive sweating. - shivering. For more Safety Content, join us; Grow Safe Private Limited