Thinning agents – Most THC oil cartridges consist of some sort of thinning agent. This is required to the oil to keep up a regularity that is optimal for vaping. The commonest thinning agents are vegetable glycerin and propylene glycol (VG and PG), which are commonly located in normal e-liquid. https://kylerlnnnm.activoblog.com/26719031/a-review-of-delta-8-thc-carts-cheap