I think my favorite RY4 is Vented from Alloy Blends, with Neckbeards Nectar coming in a close second. And one of my long time favorites, the first ever Ry4 I liked, is the RY4 from Midas. Like many Midas flavors, there is nothing extra or whatnot.. their flavors taste exactly how they are named, for better or worse. You're not going to buy their vanilla cupcake, and find surprise notes of nutmeg and egg cream.. you bought vanilla cupcake, it tastes like exactly that. Same with the RY4.. My opinion is the closest thing you will find to "Caramel, Vanilla and a hint of Tobacco". Its not the best RY4, but its a great bottle to have in your possesion.
However, the above two included.. I wouldnt call most of these RY4 blends actual tobacco blends.. they're most like dessert vapes with a robust note to keep things from being cloyingly sweet.
One of the only real tobacco vapes I found I liked, is from "The Cellar", and the one i like i called Reserve. There is also Chivalry and Minotaur.. each one is a tobacco blend aged in a type of oak barrel.. Whiskey, Brandy etc etc. There is NOTHING AT ALL dessert-y about these liquids. These are like $20 and up Cigars.
There is nothing wrong with either type.. I LOVE these dessert-orientated RY4s, I have a whole slew of them. But just be aware, aside from a few exceptions, when a liquid is called an RY4 today, its going be more dessert/rich than tobacco. Some said salted caramel.. thats a great flavor note to pick out. If its a true pipe or cigar tobacco you're after(and having it taste like those things smell.. because honestly I believe no vape liquid will ever taste like burning tobacco, ever), you gotta look elsewhere. The liquids from The Cellar are great, and also the couple I tried from VapingWatch, the RiverBottomFogSauce lline, are also very good in that regard.