@Dave **********
Yeah not the best idea even if it's worked for you so far.
If absolutely necessary enter through a LAND border, but before you do, research the rules on vaping in the country you pass through and also their customs rules.
For example, if I were you and I absolutely had to bring in vaping equipment (I neither smoke tobacco nor vape, though very very occasionally like a bit of marijuana) I would purchase a through ticket to or a one way flight to either Phnom Penh or Vientiane and then enter Thailand by land.
This is because at land borders, customs checks are very lax, especially if coming across the border by car.
If arriving by bus or on foot it's small enough to conceal inside your pant pockets, that would work too.
There will almost certainly NOT be an inspection of your luggage if entering by car from Myanmar, Cambodia, Laos or Malaysia.
There might be a brief x-ray inspection of luggage brought in by bus passengers or those arriving on foot only, across the Aranyaprathet crossing from Poipet, Cambodia and maybe Nong Khai, across from Vientiane.
Not that I would advocate any illegal activities but it's also easier to buy your way out of trouble at a land border than at an airport, where rules are more strictly followed due to greater levels of scrutiny.
If you MUST bring in such items, prepare to be a little creative in how you get into the country, as I have just suggested.