Welcome and glad you joined.safety aspect of some of the chemicals used in the flavours.
Might like to check out the vape safety section ("On the safety of ecigs"):
Vaping Quotes
"It's funny, we're all concerned if flavors have anything bad in them and yet we smoked for years knowing it was all bad. I'm going to be ...... if I get hit by a bus. My last thought is going to be "But God, I only vaped the good flavors."
Quote from a low grade forum site.