So I'm fairly new to the whole vape scene. A vape pen was given to me as a gift and I've been doing a small bit of researching on the difference between pg and vg. I'm wondering if vg can be substituted for vegetable oil, or can vegetable oil be converted into vg...don't want to .... my vape up and I really don't feel the need to buy juice when it can be so cheaply made... Help?