1. UNODC, Early warning advisory on new psychoactive substances. Home page. [Accessed: January 2023]. https://www.unodc.org/LSS/Home/NPS.
2. European Monitoring Centre for Drugs and Drug Addiction. Home Page. [Accessed: January 2023]. https://www.emcdda.europa.eu/emcdda-home-page_en.
3. New Psychoactive Substances: 25 Years of Early Warning and Response in Europe — an Update from the EU Early Warning System,2022
4. New psychoactive substances: a review and updates;Shafi;Ther. Adv. Psychopharmacol.,2020
5. Khat and synthetic cathinones: a review;Valente;Arch. Toxicol.,2014