I answered on your other thread, but I'll reply here too. The extracts are very weak because they are used in cooking. Even my homemade vanilla (made with Madagascar beans) is much weaker than the stuff used in our juice. If you add the required amount of flavoring to get to an appropriate level where you can actually taste it, you'll end up vaping more flavoring than actual nic (as you've discovered). What is not known is the safety and actual content of the extra ingredients of these flavorings. Since we are taking enough gambles, I personally wouldn't take any more (of course it's all IMHO and my 2 c). Luckily we do have other options.
Sent from my pod