There is a lot of studies that still need to be done. My personal theory is that since 1/3 of smoking related deaths are due to nicotine, e-cigs are about 66% "safer" than analog cigs.
A cursory glance at the wikipedia article also doesn't mention that nicotine is that dangerous.
Could you elaborate? I'm honestly curious.
I can't find my original sources, so please, take my personal theories with a grain of salt... Many years ago I was studying the types of cancer smokers are more likely to get other than lung cancer. After my uncontrollable urge to crunch numbers, I came up with 2/3 lung cancer, 1/3 other cancer and made an unscientific guess that nicotine plays a big part in the non-lung cancer related illness.