My main vape is 36 mg (all PG) Atomic Cinnacide from Tasty Vapor. They go up to 48 mg and sometimes I even feel the need to vape it at that level. I buy a doubler with a few 48 mg bottles.
I have flooded my mouth with juice and didn't get sick or fall over dead. I was a very heavy smoker and still smoke. I do recommend spitting it out... just in case. =D
The lower mg juices do not work for me at all. I have a 3.7v-7v mod with LR/510 atomizers/cartos, LR 306, t-tank, you name it, etc. Also, have a few 5v PTs (they drop like flies

).
Another juice I like is Ultamint from Madvapes. They go up to 36 mg, which is what I order. It's really the only other juice I've found that gives me a sufficient kick (not as strong as AC though

). It's under the "TopVapor USA" category.