Just using your post for a lead in to explaining my humble opinion when this issue comes up:
I don't think we can say vaping is 100% safe, but we can say it is safer than smoking!
Can we all agree that there is nothing, nothing at all in our daily lives that is 100% safe? I even heard an advertisement proclaiming that "research shows sitting is the new smoking", that sitting all day increases the risk of heart attack. So, No! Vaping is not 100% safe. But just where does it come in on "the danger scale", from 0% up to 100% (reversing it since "Danger Scale" sounds so much better then "Safe Scale")? If we agree nothing sits at the 0% mark, is it also reasonable to agree nothing sits at the 100% mark. So think about everything you do on a regular basis and where each might sit on the "Danger Scale." Then slip in vaping where
you think it fits based on what we know today and see just how "dangerous"
you consider it. After all, it is your choice, your call.
While we may not know all there is to know about vaping, indications are it comes in pretty low on the "Danger Scale!" Safe? No, as shown in my previous post.
Dangerous? Yes, but you must decide to what degree and if it is even worth worrying about. On my scale, it is coming in right along side jaywalking and hanging Christmas lights from the gutter.