U.S. Department of Health and Human Services. (2014). The Health Consequences of Smoking—50 Years of Progress: A Report of the Surgeon General. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK179276/
Research on Vaping:
National Academies of Sciences, Engineering, and Medicine. (2018). Public Health Consequences of E-Cigarettes. Retrieved from https://www.nap.edu/read/24952/chapter/1