Same here. Inhaling anything is not what nature intended, no matter how "cool" it is. Seems this is how I started smoking cigs 20 years ago so no judgement from me on what anyone else does with vaping, or why.
PG and VG is deemed safe, but I am not sure it has been tested for human consumption with heat applied to it and drawn into the body in a vapor form, all day long, every day.
Flavorings. Yeah seems most are tested safe for digestion, but not tested for heating and vaporizing and inhaled. Sure it's in food.... but direct inhale of it after vaporizing has not been tested. If it is cooked in an oven sure kind of the same thing, but this doesn't happen all day every day with direct lung hits, unless you are working in a kitchen or food processing plant. Even then you arent taking direct lung inhales of it.
Not sure why it so cool to do, but i can't judge since I started smoking cigs for one reason or another, but really wish I had just inhaled air since.
Ramble over, continue on and enjoy your choices.