Well, I'm kinda about ease of use, I figure adding flavorings from 3% to 20% I would create juices in a nic range from 11.5mg to 9.5mg marginally moving my pg/vg ratios from the 25/75. If I were making juices for others, I may not think this way, but I really think to start, mix a constant base, and flavor that base not worrying about being quite exact on my nic or pg/vg.