Not likely to be smoke. However TRIM failures were very common with SSDs early on and even today some distros disable or partially disable it by default (see for example this Debian warning: https://wiki.debian.org/SSDOptimization#WARNING). Upstream Linux does not enable TRIM for MD-raid devices unless you use a special kernel boot parameter. "Continuous TRIM" (which means setting the discard parameter on the filesystem so that files are automatically trimmed on deletion) is also a good way to reveal bugs and problems, some of which will merely kill performance when you delete files, and others will nuke your data.

No smoke, just stopped working entirely, and can't mount it or partition it at all. Closest I can get is with Disk Utility on the Mac, if I partition it, it acts like it's working, then it gives an error on the last block of the device, something like that.