Aroma has WTA, and juices with WTA. there are only 2 vendors for WTA. Vapelicious is the other one (not to be confused with vape-a-licious).
i dont think WTA is more harmful, but i dont know for sure. i just got my first bottle of Aroma (Mad Matador) and i like it a lot. its closer to a real cigarette than just plan nic liquid is. it triggers something in my head ever so slightly. to me its very satisfying. and the fact that its 26mg doesnt hurt either!
EDIT: Aroma does not have Dekang w/ WTA, or any Dekang juice at all. I was mistaken. I thought DK-Tab was always Dekang, but it is only a flavoring.