1. Substance Abuse
https://www.who.int/topics/substance_abuse/en/
2. Other Psychoactive Substances
https://www.who.int/substance_abuse/facts/psychoactives/en/
3. Health Consequences of Drug Misuse;National Institute on Drug Abuse,2020
4. Cost of Addiction and Substance Use
https://www.centeronaddiction.org/policy/costs-of-risky-use-addiction
5. 2017/18 Survey of Drug Use among Students;Narcotics Division, Security Bureau, The Government of the Hong Kong Special Administrative Region of the People’s Republic China,2019