I have researched and written about "The Clear and Present Dangers" of e-cigarettes and the people who have, and are following my cessation protocol in my book 'THE WINNING WAY TO QUIT SMOKING' are very aware of the dangers. At the present time even 'Big Tobacco' are trying to get on the billion dollar bandwagon. The link below is an excellent article written by Dr Mercola, which I encourage you to read.
http://articles.mercola.com/sites/articles/archive/2013/04/10/electronic-cigarette.aspx?np=true
WHERE TO BUY AND BORROW "THE WINNING WAY TO QUIT SMOKING"
Many
people around the world have been asking me where they can find my book
"The Winning Way to Quit Smoking". It is available in both kindle and
printed form from amazon.com and from amazon Canada UK France Spain
Germany Italy Japan India and Brazil (and is FREE to borrow for Amazon
Prime members). In the US it is also with Barnes and Noble, in Canada
with Indigo, in Australia with the Nile and Ebay, in New Zealand with
Mighty Ape and the Nile, in Israel with Probook, and in the Netherlands
with bol.com. It is also listed with many other distributors all over
the world.

Free for amazon prime members!
Kindle $ 2.93
Paperback $ 7.58
http://www.barnesandnoble.com/w/the-winning-way-to-quit-smoking-shirley-amy/1109560301?ean=9781468038569
http://www.bol.com/nl/p/the-winning-way-to-quit-smoking/9200000002549251/