I have just started vaping about a good week ago and currently vape everywhere! In my house, my car, even if others are around. (As long as they don't mind). I don't feel it's harmful, but I'm no scientist. If something was toxic in the e-liquid I think we would know all about it, such as food coloring... I'm not fully aware of the toxins in food coloring but from what people are saying, I guess just something about food coloring in e-liquids isn't right. But Vaporizing has practically become a culture, leading to many scientific investigations on electronic products itself, leaving us with most of our answers, answered. Therefor until I hear from a scientist that vaporizing is harmful, I will continue to vape on!