The article being sited here was one where a lab found tin, when they spun the vapor produce in a centrifuge.
There is an element of truth in this, however it is not true of all devices. Anyone using a carto or other such device is at higher risk, those using kanthal to make their own are a little/no risk.
The problem, or reason this is true with carto type devices is due the solder holding the coil wire to the positive terminal of the 510, and yes, I have opened several up and it is solder..... a weld wont melt with a lighter, solder will, so try it on yours.
That said, solder has a liquid heat range(flowing), and a venting heat range. Most solder starts to melt at about 180 C. So, as solder contains tin, and starts to melt a 180 C "venting" or "off-gasing" temperature is below 180 C..... I could not however, find a definitive answer on temperature for this.
The conditions for this will vary depending on how high you power level, and how dry you let the device get before refilling.... less juice=more heat. IDK if it could happen under "normal" use or not.... but it's VERY plausible, and why I wont use cartos and the like.