The VG/PG ratio of an e-liquid expresses what percentage of vegetable glycerine and propylene glycol the vape liquid contains as a base. The VG/PG ratio doesn’t include the vape juice other ingredients. For example, a 50/50 e-liquid contains a base consisting of half VG and half PG along with nicotine and flavourings. A VG/PG ratio of 50/50 is, in fact, ideal for most types of vaping equipment and will allow you to enjoy many of the benefits of both VG and PG. Some people, however, prefer e-liquid with a VG/PG ratio skewed in favour of either VG or PG. The two liquids both have certain benefits that they contribute to a vape juice.