N-Nitrosodiethylamine is primarily encountered as a contaminant rather than a deliberately used chemical in industrial applications. It can form in certain processes involving nitrites and amines, such as in food preservation, tobacco products, and rubber manufacturing. Its presence is a concern due to its potent carcinogenic properties, leading to strict regulatory controls to minimize exposure. It has no safe commercial application and is avoided in consumer products. Research use is limited to toxicological studies, focusing on understanding nitrosamine-induced carcinogenesis and mechanisms of DNA damage. Monitoring and detection of this compound are critical in pharmaceuticals, food, and environmental samples to ensure safety and compliance with health standards.