Yes it s out there, mountain vapor, and California juice co both have coffee flavors that have natural caffeine. The levels are so low you would have to vape a few tanks to get "a buzz"
You can mix all you want! Sometimes it works out great, sometimes not so much. Try mixing a mall mount in a spare bottle, ad mints and menthols go a long way so just a few drops to start, shake well, test, and then add more if need be...