I'm posting this link here because this area of the forum seems to get the most traffic, and besides being safety issues, I think these are also general e-smoking discussion issues.
http://www.e-cigarette-forum.com/forum/health-safety-e-smoking/291279-big-3-a.html
http://www.e-cigarette-forum.com/forum/health-safety-e-smoking/291279-big-3-a.html