Glad to see some vape defenders around here! I forgot the exact figure, but I believe at a little over 400 degrees Fahrenheit you get formaldehyde and other weird shit produced when you burn the... okay, I just looked up a link and now I'm even more confused than I was before.
Not knocking vaping, personally I vape for harm reduction, just throwing this out there.
Well, on my earlier point, we see that (I mean it's logical if you think about it) heat itself is actually one of the factors that cause cells to have problems fixing damage done to them, so to be on the safe side you should aim for a cooler vape temp.
And yes, vaping is a more effective tool for reduction or cessation than patches, gums, or any other treatment available from "friendly" pharma companies.
Oh, and some flavors are actually harmful but lots of companies making the liquids have phased out some of them as a precaution, I guess I could find links on that if anyone wants, or you can search for them yourself. The specs I looked at indicated that a lot of nut/spice/peppermint type flavors were on the more potentially dangerous side (fruit flavors are a safe choice in general it seems), as well as the old cream-type flavors that hardly anyone uses anymore.
Thankfully with e-liquids designed for high-power devices (like the ones I use), they contain only as much as 10-30% of PG, compared to the kind designed for low power devices which can contain between 50-100% PG.
Some vape juices go as far as being 100% VG, however this can be problematic for certain flavours, and can make it difficult to dissolve nicotine.