1. Tobacco-free electronic cigarettes and cigars deliver nicotine and generate concern;Pauly;Tob Control,2007
2. Babej M . E-cigarette Sales Surpass $1 Billion As Big Tobacco Moves In [Internet]. Forbes. [cited 2013 November 12]. http://www.forbes.com/sites/natalierobehmed/2013/09/17/e-cigarette-sales-surpass-1-billion-as-big-tobacco-moves-in/
3. Bohlen C . In France, an E-Cigarette Bubble? N Y Times [Internet]. 2013 October 21 [cited 2013 November 12]. http://www.nytimes.com/2013/10/22/world/europe/in-france-an-e-cigarette-bubble.html
4. King BA, Alam S, Promoff G, et al. Awareness and Ever Use of Electronic Cigarettes Among U.S. Adults, 2010–2011. Nicotine Tob Res [Internet]. 2013 February 28. http://www.ncbi.nlm.nih.gov/pubmed/23449421 http://ntr.oxfordjournals.org/content/early/2013/02/20/ntr.ntt013.full.pdf
5. Electronic cigarettes: a new “tobacco” industry?;Noel;Tob Control,2011