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3. Does e-cigarette consumption cause passive vaping?;Schripp;Indoor Air,2013
4. Stimson G. New estimates double size of US e-cigarette market; increasing importance of refillable and modified devices http://nicotinepolicy.net/gerry-stimson/1317-wells-fargo-march-2014 http://www.webcitation.org/6TVxSsvvR
5. Action on Smoking and Health (ASH) Use of electronic cigarettes in Great Britain www.ash.org.uk http://www.ash.org.uk/files/documents/ASH_891.pdf http://www.webcitation.org/6TVxrpdGH