Tobacco + caramel + vanilla = vaping perfection. At least, that is what fans of RY4 keep saying, and we agree with them! RY4 may be the ideal tobacco flavor for inclusion in tobacco e-liquids, so grab a bottle or two and try it out. RY4 is great for an all-day vape, and just as great when its flavor is complemented with other strong flavors. We hope you to share your personal recipes with us so that we can try them, too! WARNING: this tobacco flavor is highly concentrated. Start at 1%, and then adjust to taste.