Hello, I would go to Philippines, but I'll transit through Suvarnabhumi Airport.

 

As the e-cig vap is banned in Thailand.. does transiting without exiting customs of the airport can be risky ? ( ZURICH - BKK - MANILA )

 

Right, on theory we doesn't pass the customs, but if someone is caught with kilos of heroin in the transit point they will caught him surely..

 

and the e-cig cannot be placed into the check-in bag, so I don't know if it's possible to transit the e-cig to SVB airport without problem.. into the carry-on bag

 

Ah, what's funny, I found before many e-cig on Sukhumvit Rd selling in outside store.. at evening

 

You should be fine, you are not entering Thailand. 

I put my e-cig and juice in my carry-on bag and stand in the smoking zones puffing it every time I pass through Don Mueang, which is about every two weeks, and I've never had a problem.