Most people use tobacco Absolute as an additive, but I find the taste great all by itself - a very smooth mild tobacco flavor with no other additives attempting to mimic the tobacco taste. There are several variants of the stuff, but I find the Bulgarian Rustica the best. It comes in either a super concentrated version like a paste, or diluted 50% in pure grain alcohol. Both versions are super potent. You will have to dilute them further in pg, and treat THAT as a concentrated flavor to be used at 2-3%. Do NOT use the super concentrated by itself or you will be sorry 