Recently, Craters of the Moon banned e-cigarettes from their property. I feel like there are so many things we don't know about e-cigarettes.

Currently, there are no regulations on e-cigarettes. I've seen e-cigarettes being used in office environments, malls and other public places where regular cigarettes aren't allowed. Some people are suggesting that the second hand smoke from an e-cigarette is water vapor so it isn't harmful like regular second hand smoke. This may be true but I'm not sure if I would let someone smoke an e-cigarettes in my house.