Can the nicotine in electronic cigarettes cause heart disease?

Controversial : E-cigarettes were introduced into usa market in 2007. It's a vaporizer of liquid nicotine without tobacco. In 2009 fda tested few varieties. Few known cancer producing agents were found. Resulting in fda publicity discouraging the use of e-cig. That move raise more controversies. Other medical association recommend its use. No data on heart disease at this moment.