This actually happened to me the other day. I'm very hard on mine, I'm constantly
vaping if I'm awake (if I can).
I've got two atomizers, and my first one died. When it did so I was in the car
vaping. I had no notice, it just stopped working. I was using a USB pass-through and the LED was responding as normal... but no puff.
My first thought was the pass-through crapped out. But usually if the LED works, it works. I've gone through 4-5 pass-throughs, but never had an atomizer die (in the ~3 months I've been vaping).
After taking the pass-through a part (since that's what I assumed the problem was), I finally decided it was the atomizer. I had no way to tell since I was out of town on a trip and I didn't have my backups with me. I ended up going to a Pilot gas station and getting a new NJoy starter kit. I took the new atomizer on my existing pass-through, and it fired right up.
SO, in my particular case, it was a silent death. One minute I was using it, and the next... gone.
When I was a "newer" newbie, I would do dry burns after blowing out the atomizer to clean it. After reading more about it I found this is bad (can kill the unit or reduce it's lifespan). But none-the-less I did it and that thing lasted like I said for 3 months of hard use. But if you read more posts on here you'll find that experiences can vary WILDLY. It may last a day or it may last much longer.
In the end it WILL die, and unless you've got backups, you're going to go without

. Which may lead you on a trip to the gas station for a "traditional" cig, and that's a path we'd best avoid!!!!