In a nutshell, yes, I'm concerned about the long-term effects of vaping. And in a nutshell, I would rather be inhaling 4 or 5 or 6 vaporized liquids/chemicals with relatively unknown effects that are FDA approved than inhaling 7000+ carcinogens that are KNOWN to have adverse effects on health (and are also FDA approved, by the way).
I'm curious about where you got your information about the toxicity of PG, thoughh. There are several old and inaccurate studies still floating around (and still being cited as 'gospel' by the fear mongering media) concerning PG. The conditions used during those studies were unrealistic.