So my disposable vape just stopped working completely. No light, no vapor, nothing. I bought it yesterday and it was working fine this morning. It's not rechargeable so I can't plug it in. Is there anything I can do or is it just dead?

That's frustrating, especially for a device you just bought. There are a few things to try before you give up. Check if the airflow hole is blocked, sometimes lint or debris gets in there. Give the bottom of the device a few firm taps to reset any loose connections inside. If there's a small rubber plug covering a port, remove it and blow gently through it to clear the airpath. Fire Elf has a troubleshooting article that covers this situation in detail. Read through troubleshooting a non-working device on their blog. The Fire Elf guide goes through different symptoms and fixes for each one. I've used Fire Elf's troubleshooting guides a couple of times and they've helped me figure out what was wrong. If nothing works though, it might be a dud.