I would suggest Hangsen Red concentrate at 2.5-3%.
well thanks everybody for your help, I don't really know what flavor he is going to settle on right now he buys his liquid from a place called eliquid market and the one he is partial to tastes like marlboro red and the other one is camel. I was looking at some 3ml sample flavors on Pure Vapes made by flavourart and I think he is just going to buy a few of them and see what he likes.