You can do it with
eliquid flavoring (see OneStopDIYShop.com) and just add some to your bottle of tobacco liquid (or a small bottle with some of your tobacco liquid in it). Or the way I do it by using a tobacco liquid I like and a fruit liquid I like and just mix in the cart or carto - want it more peachy, add more peach, want more tobacco-y add more of that.
Vixen Vapor has a nice peach as does Backwoodsbrew and there are many other good ones.