I would personally take something "disposable" in my carry-on, and just do your best to declare it on your way over, possibly even stopping in at customs as you land.Well this is a bit unsettling, seeing as my flight is in a few hours.
I'm not going to Bangkok though and plan to only vape in the hotels.
I honestly can't decide if it's worth it to take it with me in my check in bag.
A Thai prison would not be a nice way to spend Christmas day.