Let's build a positive community where we can help everybody quit smoking cigarettes to increase physical quality of life
I personally do not have one. I will hit my friends' e-cig every one in a blue moon. I have no interest in getting one myself. I feel like they are not a great way to stop smoking because you are still bringing a foreign chemical into your body. They aren't as bad as cigarettes, but the healthiest alternative is to let your lungs be.
This is an article posted by /u/bradd that basically says we don't know enough about long term health from e-cigs to make a call. There have been a lot of studies, but many of them have been supported by an interested case, leading to heavy bias. It does say that they are helping people to quit smoking, though.