Actually, the amount of nic doesn't have any impact on the amount of VG, or PG, or PGA, or whatever medium you're using to carry the nic. A juice with 18mg of nic may have any ratio of PG/VG from 0%PG/100%VG to 100%PG/0%VG ... the amount of nic largely affects throat hit, and can also make phlegm worse because phlegm production is a natural bodily defense against irritation and inflammation, both side effects of nicotine inhalation ...for me i notice this when i use higher nic juices. do higher nics use mor vg? or it depends?