I am a type 2 diabetic for over 5 years. I have been
vaping for a little over 7 months. My A1C has dropped from 6.5 to 6.1 since starting to vape. My blood pressure has dropped and I am breathing better. My doctor confirms my lungs are clearer. I lost 20 pounds. If I vape 100% vg juice I do feel a heaviness in my chest, as do a number of other people I have talked to. I usually vape 50/50 or 70/30.
The amount of sugar in vg is small, especially in the quantity consumed vaping by most people. Are you sure it is metabolized the same as if ingested? Please post a link to your reference or article. There are some threads here on ECF for you to search for and read regarding the sugars in vg and pg.
Of course, everyone is different and may have other health conditions to consider. If your friend is concerned, she should contact her doctor.
I have heard stories of nicotine affecting blood pressure and you can vape too much nicotine. I am not in the medical profession and this is just my personal experience. There is a health and medical forum on ECF. You should be reading that section for information.