yeah some companies don't and have been called out on it...I'll give you that
I stuck to the vegetable glycerin base because of some of the sketchiness of some manufacturers...I won't claim they're healthier but I can make a correlation with feeling better smoking just those vs regular cigarettes
I doubt a lot of people really look into it and could be potentially going from the frying pan to the fire
not picking up a nicotine habit at all would be ideal obviously