Here's what I do....I normally order 24mg of my favorite brand (USA Tobacco, 555) and them add flavors like menthol, vanilla, or caramel at 12mg. By mixing the two at different proportions, I get a nic level that works for me (at around the 18mg nic level). I used to vap straight PG, but have found my sweet spot at 70%pg 30%vg. The VG creates a better vap. You can also purchase pure VG at your local pharmacy or at a place like Micheal's. The brand that I use is Wilton's, just make certain its the food grade VG (normally says food grade or USP on the bottle. Therefore, you can dilute any PG mix with pure VG, and reduce the nic content that way as well.