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The oil within the cartridge is where the main event takes place. There are many ways of extracting the active ingredients from marijuana plants, namely THC and cannabinoids, to convert them into an oil form. Oil cartridges utilize what is known as solvent-based extraction. Without going too much into the science behind extraction, which can be highly complex and even dangerous, essentially the solvent will dissolve the solid form of the plant, leaving a highly concentrated oil.