I saw this buried in the UK Vapers report................seems the journal of Nicotine and tobacco control are waking up....finally.
http://m.ntr.oxfordjournals.org/content/early/2016/02/11/ntr.ntw031.full.pdf
http://m.ntr.oxfordjournals.org/content/early/2016/02/11/ntr.ntw031.full.pdf