1. Medicines and Healthcare Products Regulatory Agency. Guidance for licensing electronic cigarettes and other inhaled nicotine-containing products as medicines. Updated 29 Oct 2021. https://www.gov.uk/guidance/licensing-procedure-for-electronic-cigarettes-as-medicines
2. Nicotine without smoke—putting electronic cigarettes in context
3. Nicotine, Carcinogen, and Toxin Exposure in Long-Term E-Cigarette and Nicotine Replacement Therapy Users
4. Committee on Toxicity of Chemicals in Food Consumer Products and the Environment. Statement on the potential toxicological risks from electronic nicotine (and non-nicotine) delivery systems (E(N)NDS—e-cigarettes). 2020. https://cot.food.gov.uk/sites/default/files/2020-09/COT%20E%28N%29NDS%20statement%202020-04.pdf
5. Action on Smoking and Health. Use of e-cigarettes (vapes) among adults in Great Britain. 2021. https://ash.org.uk/information-and-resources/fact-sheets/statistical/use-of-e-cigarettes-among-adults-in-great-britain-2021/