I did quite a bit of research before attempting this RY4 mix. I own several RY4 concentrates, but I haven't been satisfied with any. There was a RY4 craze going on at ELR, but to me it wasn't a true representation of what I thought a RY4 should be. So I made one from Tobacco concentrates that I've enjoyed over the years.

For the taste of this mix I get a tobacco taste that's very prominent, followed a good caramel note and a very soft vanilla. Menthol is optional as I enjoyed menthol tobacco.

This ain't that bakery RY4 that some vapers enjoy, but a tobacco forward RY4 for those looking for a good tobacco flavored vape.

Notes I found to be invaluable in creating this mix…

What is RY4 E-Liquid
History:

RY4 E-Liquid was originally made by Chang Ning Dekang Biological Technology Co. for Ruyan Group Limited. Dekang defines the RY series as so (slightly modified for better translation);

RY1: Very subtle mixture of Tobacco aromas
RY2: Taste dry tobacco, raw, with no sweet aftertaste
Ry3: Exceptional blend of tobaccos, slightly sweet taste quite indescribable
Ry4: Tobacco blend with the trends of caramel and vanilla

The RY4 flavour became an instant hit, and every other E-Liquid manufacturer and DIY hobbyist set out to re-create this complex E-Liquid.

RY4... Amongst most vapors is considered legendary. With its foggy history, dozens of variations, and rumors of a rogue chemist hiding out in a cave somewhere in China. Clenched in his hands the stolen recipe of the "real RY4" so overtaken by the aroma that not even in the grips of his impeding death, would he set it free.

Ok, so that last part was made up.

Flavour:

For an E-Liquid to be classed as RY4 it must contain all of the 3 principal ingredients. They are Tobacco, Caramel and Vanilla.

The great variety of RY4 flavours are a result of the many different combinations of the main 3 ingredients.