How can u make a nic juice a higher mg nic? For instance I have 16 mg aporox 10 ml juice that I would like to make 18 mg juice. I have 54 mg nic juice in pg or vg from tw. How many drops would I add? Is there a calculator that does this? And if I wanted to add straight vg to it without lowering the 16 mg how would I do that?