Its also an known irritant and humectant (helps the tissue better absorb moisture, which is why many e-cigarette users report symptoms like dry throat), so its definitely not harmless, but its not known to be cancer-inducing, like some people would have you believe, and its certainly less hazardous than tobacco smoke.
They feature suggestions from former smokers on how to get dressed with a surgical opening in the neck, artificial limbs or scars from heart surgery
This case is designed to fit a standard 2"x3.5" pack and has a convenient side slot for a disposable lighter
It has been shown to cause several types of cancer, including mouth cancer, lip cancer, and tongue cancer
Beyond that, as a curious consumer you might imagine any number of possible ingredients, but the recipe is a well-guarded industrial secret