GeidneS., BackmanL., EdvardssonI., & HulldinJ. (2016). Prevalence and risk factors of electronic cigarette use among adolescents: Data from four Swedish municipalities.Nordic Studies on Alcohol and Drugs, 33(3), 225–240.
2.
Public Health England (2015). E-cigarettes: An evidence update.London.
3.
Royal College of Physicians (2016). Nicotine without smoke: Tobacco harm reduction.London.