well i have asthma and ill tell you that pg is method of transport in asthma nebulizers which dont heat but still vaporize the solution and you breath it in and it delivers the albuterol to you that way.... glycerin is not toxic to us either as it is a humectant which means keeps you moist basically if you notice when you first start vaping the vg give the vapor a dense or full feeling that isnt there with pg alone and that is because vaporized vg sucks out the water in the air and makes the particles heavy and dense giving you the aforementioned feeling
so from this asthmatic both of those items are a non issue in terms of dangerous to our health
so from this asthmatic both of those items are a non issue in terms of dangerous to our health