Thinning agents – Most THC oil cartridges consist of some form of thinning agent. This is required for your 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 generally present in regular e-liquid. https://johnnyxyyxg.izrablog.com/27062966/manual-article-review-is-required-for-this-article