We don’t recommend using an actual grinder, because if you get the flower too fine, a lot of it won’t filter out during refinement and you’ll be left with a lot of ground-up herb in your final vape liquid. Just break the bigger nugs apart with your hands until everything is a smaller, uniform size. Here are the steps, in order: Break up the raw buds into smaller pieces by hand.
Cover your baking sheet with aluminum foil, and spread out the buds onto the sheet. Place the baking sheet into the oven at a temperature of 250℉ (121℃) for about 30 minutes. This is a crucial step because it decarboxylates the THCA in the raw buds , into psychoactive THC. Take the buds out of the oven and let them cool off for a few minutes. Dump the buds into your glass jar with the sealing lid, and pour just enough vegetable glycerin (VG) over them so that it saturates the buds . You do not want to use too much VG, because your end product will end up becoming super diluted and will have almost no psychoactive effects. If you use the right amount of VG, you should be left with a thick, clumpy, gooey mixture that’s easily stirrable but not too liquidy.
Stir up the mixture, seal the lid, and put a label on it with the date. You will let this sit in a safe, cool, dark, dry place for about a month. After a month or so, take the jar out and stir it up thoroughly. Add about a tablespoon of fresh VG in order to keep the THC extraction process moving along. Stir/mix up again, and set aside in a safe place for another month. Repeat this same process, adding another tablespoon of fresh VG. Place back in a cool, safe place for one more month. (On a side note, feel free to mix/stir up the jar as frequently as you want during the three month period, even on a daily basis if you want. After the last month is up, take the mixture out and stir it up nicely with your stirring wand. Then, place your small wire mesh strainer over a clean glass jar (this one doesn’t need a seal), and dump the cannabis/VG mixture into the strainer. Let all of the VG drip through the strainer, using the rubber spatula to squeeze out as much remaining liquid as you can. Discard the raw cannabis material, clean off your mesh strainer, and then cover the strainer with about four layers of cheesecloth (you can also use a cotton muslin bag). Pour the cannabis/VG liquid mixture onto the cheesecloth or muslin bag, letting it drip through into a clean glass jar (you can use the same one that you did for the first filter as long as you clean it out). Squeeze out any remaining liquid from the cheesecloth/muslin bag as you can, and then you’re done! If everything went correctly, you should be left with a clean, debris-free VG liquid infused with THC extract, at which point you can use a syringe or dropper bottle to add to your vape cartridge. (For maximum effect and taste, allow about 15-20 minutes after you add the THC e-juice to the vape cartridge before you begin vaping. This allows the wick to fully absorb the e-liquid). THC Oil for E-cigs: Method #2 – Vegetable Glycerin Extraction (Short-Term) So this method involves pretty much the same process as the first method, although it involves heating the cannabis/VG mixture to drastically speed up the process (from three months to only about 3-4 hours). Here are the materials that you’ll need: Raw cannabis flower Pure USP food grade vegetable glycerin Canola or vegetable oil (for oil bath heating) Pot for boiling (or preferably glass Pyrex jars/dishes that can sit on a stove burner) Stovetop Two precise thermometers (cooking thermometers work well) Fine mesh strainer Cheesecloth Mixing/stirring wand Rubber spatula. Basically, this method involves mixing the raw cannabis flower into VG just like you did in the first method, but instead of letting it sit for months/weeks at a time, you’re going to “cook” the liquid mixture in an oil bath to dramatically speed up the diffusion process. Here are the steps: Break up your raw cannabis buds by hand into relatively small pieces and dump them into a Pyrex (or other heat-safe) glass jar. Pour just enough vegetable glycerin (VG) over the buds to saturate them, but be careful not to add an excessive amount. Stir the mixture up until it is evenly distributed. You should be left with a thick, clumpy, cannabis/VG mixture that’s not too liquidy. Pour some of your canola oil or vegetable oil into a larger Pyrex/heat safe pan.
You will be setting the Pyrex jar with the cannabis/VG mixture into this oil, and letting it heat up in the “oil bath.” (You’ll want to put enough canola oil into the glass pan so that only about 1-2 inches of the jar with the VG mixture sits submerged). Put the pan with the canola oil onto a stovetop or hot pad, and heat it up until it’s at a consistent 220℉ (this is an important step, and is why you need a good, reliable cooking thermometer).
Once at temperature, place the glass jar with the cannabis/VG mixture into the hot oil bath. You’ll want to use a separate thermometer for this jar, and try to maintain it at a temperature as close to 180℉ as you can (in other words, you’ve got the outer oil bath boiling at 220℉, and then the inner glass jar sitting in it and boiling at 180℉. This temperature is crucial as it allows the THC from the raw buds to diffuse into the VG liquid.