Someone mentioned the concentration was >1ppm. In other words, measurable, but negligible. Vaping being bad for you is more directly comparable to smoking. You

Someone mentioned the concentration was >1ppm. In other words, measurable, but negligible. Vaping being bad for you is more directly comparable to smoking. You are inhaling hot water vapor and a bundle of chemicals into sensitive lung tissue. We've known that smoking is bad for you for decades. We don't really need new science to explain vaping.