Renegade, I just want to say that Vapor4Life has (had?) a Banana Menthol flavor called Banana Breeze and I love it! Keep in mind that taste is subjective. I would imagine the cola menthol wouldn't be too bad. Just a cool flavor to the cola flavor. So it'd be like a coke out of a fridge instead of hot or room temperature. Let us know if you end up giving it a try!
Also, the small smileo holds 3.5ml of juice. So only about 1/10 of a bottle (my math isn't all that great, I think that's how it works though).