I do make up pre-made 16mg nicotine bases. I haven't much noticed enough difference in the strength being decreased by adding flavors to worry about making them higher than 16mg, which is what I use. They still come out strong enough. I like having them pre-made so I can just sit and mix when the urge hits me or when necessity hits. I'm not the only one vaping on my juice and I make it in two different strengths. The other individual doesn't notice a difference in strength either. I have vaped just the base when I didn't want to bother people with an odor, not knowing who would be bothered by what, and never could tell the difference between the base or the flavored.