I believe e-cigs are far better for you compared to any other smoking such as cigarettes, cigars, and hookah. The thing that makes e-cigs different than the other smoking options is e-cigs lack tobacco and you have the option of using nicotine. Although it is not as good as keeping your lungs free entirely, e-cigs/ vaporizer pens have shown no true harm to the human body and serve as a great alternative for someone who is choosing to kick their addictions.
The issue with cigarettes is that they are filled with harmful substances that can lead to lung cancer. Since e-cigs are just vapor, the biggest issue with cigarettes is eliminated. Many people have a nicotine addiction and this is a good way for those people to get their fix with less detriment to their health and to potentially ween themselves off smoking. E-cigs are a tremendous step in the right direction for the health of avid smokers.
I got my first electronic cigarette kit at VistaVapors, and I enjoy it a lot.