Nope.. not VG.
Add a touch of Glycerin .. you can find this in the cake decorating section. It doesnt have a flavor to it at all and only intensefies the flavors you use. It also makes you have more vapor.. but do not over do it. At most .. you will only want to use maybe a total of 1 mil per every 4 mils of juice you make. If you use too much glycerin.. it will clog. But, you also want to watch how much flavor you add to an already mixed juice like you were asking.
If you are going to do that.. I would recommend you get a 4 to 5 mil plastic dropper bottle and proportion your mix. use 2.5 base ( say your base is 24 mg nic juice that has a marlboro red cig flav), then add 1.25 of the additional flavor you want to add .. or play around with how much you add to make the cig flavor more dominant but don't add more than 1.25 mil. Then, add up to 1 mil of glycerin .. put the cap on and shake.. now you are ready to smoke it up.