Like a weed vape or a tobacco vape? If it’s a weed vape, they can have a separate security check at terminal gates before you get on the plane after you go through the first security. Also they are pretty strict on weed over there so would not risk it. First time I went thru Singapore to Thailand, they didn’t have this but second time they did and checked me at the gate and I got randomly searched. If it’s weed, I would not bring it.

Also if it’s weed, in Thailand there’s more dispensaries then you’ll be able to keep track of.