Many cannabis vape cartridges and edibles start with the same ingredient: distillate. It is a clear, honey-like oil that is mostly one cannabinoid, usually THC or CBD, made by stripping a crude cannabis extract down to its cannabinoids with heat and vacuum. Short-path distillation is the classic way to make it.
What is cannabis distillate?
A refined cannabis oil in which one cannabinoid dominates. It is the product of several steps together: extraction pulls the cannabinoids out of the plant, preparation such as winterization removes waxes and fats, and distillation separates the cannabinoids from the terpenes that give cannabis its smell and from heavier material such as chlorophyll[1, 2]. What is left is a viscous, typically clear to amber oil with little taste or aroma.
How pure it is depends on the starting material and the process. In one published optimization of hemp oil, wiped-film distillation raised CBD to about 80% of the product while recovering more than 92% of it[3]. Higher figures are common in marketing; ask for a certificate of analysis rather than relying on a label claim.
How is distillate made?
A typical workflow has four steps, though processors vary the order and details.
- Extraction. The plant is first extracted with a solvent, typically ethanol, a hydrocarbon such as butane, or supercritical CO2, to make a crude oil[2]. Our guides to butane hash oil, quick-wash ethanol and hydrocarbon extraction and supercritical CO2 extraction cover these.
- Winterization. The crude oil is dissolved in ethanol, chilled and filtered to remove waxes, which would otherwise thicken and cloud the final product[1].
- Decarboxylation. Heating converts the plant’s acidic cannabinoids, THCA and CBDA, into THC and CBD[1].
- Distillation. The oil is heated under deep vacuum and its components are collected separately as they evaporate.
How does short-path distillation work?
Cannabinoids have high boiling points, and heating them enough to boil at normal pressure would damage them. Lower pressure lets cannabinoids evaporate at lower temperatures, reducing thermal damage and exposure to oxygen[1].
“Short path” refers to the distance the vapour travels. The condenser sits close to the hot surface, so evaporating molecules reach it with few collisions along the way, which makes separation efficient even at very low pressures[1]. Processors usually run the oil through more than once:
- First pass, the light fraction. The most volatile compounds, including terpenes and any leftover solvent, evaporate first and are collected separately[1]. Our article on terpene boiling points explains why published figures for individual terpenes can mislead.
- Second pass, the cannabinoid fraction. At higher temperature and lower pressure, the cannabinoids evaporate and condense as distillate, leaving chlorophyll, waxes and other heavy material behind as residue[1].
Batch or continuous. The simplest short-path setup is a heated glass flask, distilled one batch at a time. Larger producers often use wiped-film stills, in which rotating wipers spread the oil into a thin film on a heated wall, so it spends only a short time on the heat and can be fed continuously. Many wiped-film systems also use a short vapour path; the research cited here used wiped-film short-path distillation[1].
Limits. In the hemp study cited above, the wiped-film process enriched CBD but did not remove THC, so that process could not on its own produce a THC-free CBD oil[3].
Why does distillate have so little flavour?
Because the terpenes were removed by design, in the first pass. Distillate keeps the cannabinoid but loses most of what makes one cannabis plant smell and taste different from another. Some argue that this also loses part of the plant’s effect, through the so-called entourage effect. The evidence that terpenes change how cannabinoids act in people is still thin; our review of the entourage effect weighs it, and our guide to cannabis terpenes covers the compounds themselves.
How are terpenes put back in?
Many distillate products have terpenes blended back in, for flavour and to thin the oil. There are two main sources:
- Cannabis-derived terpenes, recovered from cannabis itself, sometimes from the same distillation run.
- Non-cannabis terpenes, either extracted from other plants or made synthetically, and blended to imitate a particular cannabis aroma.
Either way, the terpene profile of a distillate product is a blend chosen by its maker, and it does not necessarily reproduce the original plant’s profile. Our article on terpene preservation and reintroduction looks at what is lost after harvest and how terpenes are put back.
Thinning agents raise a separate issue. In 2019, an outbreak of lung injury linked to vaping, known as EVALI, led to 2,807 hospitalized cases or deaths across the United States by February 2020, including 68 confirmed deaths. The CDC identified vitamin E acetate, which had been added to some THC vape liquids, as a primary cause[4]. Unlabelled cutting agents have continued to turn up: in a 2022 study, 11 of 27 delta-8 THC vape products contained them[5]. Vape hardware can add contaminants of its own, as our article on heavy metals in vape cartridges explains.
How does distillate compare with live resin, rosin and RSO?
| Distillate | Live resin | Rosin | RSO | |
|---|---|---|---|---|
| How it’s made | Solvent extract, winterized, decarboxylated and distilled | Hydrocarbon extract of fresh-frozen plants | Heat and pressure, no solvent | Whole-plant solvent extract, solvent evaporated |
| Terpenes | Removed; often added back | Retained, a selling point | Retained | Reduced as the solvent is boiled off |
| Other plant compounds | Mostly removed | Many retained | Many retained | Most retained, including chlorophyll |
| Typical use | Vape cartridges, edibles | Dabbing, vaping | Dabbing | Taken by mouth |
| Our guide | This page | Live resin | Rosin | RSO |
For a closer comparison of two of these, see BHO vs rosin.
Is delta-8 THC made from distillate?
Indirectly. Distillation concentrates whatever cannabinoids are in the extract; it does not make new ones. Delta-8 THC products are typically made by chemically converting CBD, from hemp, into delta-8 THC, a process that can leave by-products whose safety in people has not been tested[6, 7]. The result is often then distilled and sold as “delta-8 distillate.” Our articles on THC isomers, synthetic cannabinoids and our interview with chemist Mark Scialdone explain the chemistry.
The law is changing too. As summarized by the Congressional Research Service in September 2026, cannabinoids that occur naturally but are manufactured outside the plant, the category that covers converted delta-8 THC, fall outside the federal definition of hemp from December 11, 2026; the same changes bring in a total-THC standard and a cap of 0.4 milligrams of total THC per container for hemp-derived products[8]. Our explainer on the 2026 hemp redefinition has the details. State laws vary, and this is not legal advice.
What should you check on a distillate product?
- Potency. The certificate of analysis should list the measured cannabinoids, not just a headline percentage.
- Residual solvents. Distillate starts as a solvent extract, so solvent testing matters.
- What was added. Check the product’s ingredient list for added terpenes and other ingredients, and whether the terpenes are cannabis-derived. A routine certificate of analysis is not necessarily an ingredient list.
- Contaminants. Distillation concentrates cannabinoids; a pesticide or heavy-metal panel shows whether anything unwanted came along.
Our guides to reading a certificate of analysis, cannabis testing methods and contaminant testing explain the numbers.
How is distillate used?
Mostly in vape cartridges and edibles, because it is already decarboxylated and has little taste or smell. It is also dabbed, put into tinctures and capsules, and used to coat flower. Because THC-rich distillate is highly concentrated, small amounts carry a large dose of THC. Start low, and with edibles wait for the effect before taking more.
The short version
Cannabis distillate is a refined oil made by stripping a crude extract down to its cannabinoids with heat and deep vacuum, most often by short-path distillation, in batch or wiped-film stills. Together with extraction and winterization, the process removes terpenes, waxes and chlorophyll, which is why distillate tastes of little and is often flavoured with terpenes afterwards. Distillate is only as good as what went into it and what was added later, so check the certificate of analysis for measured potency, residual solvents and contaminants, and the ingredient list for anything added.
References
- Sagili SUKR. Optimization of post-harvest processing of dried cannabis (Cannabis sativa) inflorescences, including particle size reduction, extraction, decarboxylation, and molecular distillation. MSc thesis. Montreal: McGill University; 2023.
- Valizadehderakhshan M, et al. Extraction of cannabinoids from Cannabis sativa L. (hemp): review. Agriculture. 2021;11(5):384. doi:10.3390/agriculture11050384
- Valizadehderakhshan M, Kazem-Rostami M, Shahbazi A, et al. Refining cannabidiol using wiped-film molecular distillation: experimentation, process modeling, and prediction. Ind Eng Chem Res. 2022;61(19):6628-6639. doi:10.1021/acs.iecr.2c00290
- Centers for Disease Control and Prevention. CDC, states update number of hospitalized EVALI cases and EVALI deaths. Media statement. 25 February 2020.
- Meehan-Atrash J, Rahman I. Novel Δ8-tetrahydrocannabinol vaporizers contain unlabeled adulterants, unintended byproducts of chemical synthesis, and heavy metals. Chem Res Toxicol. 2022;35(1):73-76. doi:10.1021/acs.chemrestox.1c00388
- Geci M, Scialdone M, Tishler J. The dark side of cannabidiol: the unanticipated social and clinical implications of synthetic Δ8-THC. Cannabis Cannabinoid Res. 2023;8(2):270-282. doi:10.1089/can.2022.0126
- Centers for Disease Control and Prevention. Increases in availability of cannabis products containing delta-8 THC and reported cases of adverse events. Health Alert Network, CDCHAN-00451. 14 September 2021.
- Neuhofer ZT. Changes to the statutory definition of hemp and implications for agricultural policy. Congressional Research Service In Focus IF13136. Updated 28 September 2026.
This article is an educational summary. It is not medical or legal advice.
Featured image: original illustration by Terpenes and Testing, in the style of a 19th-century scientific plate.
Editor’s note: Originally published June 2018 by Heather Ritchie as “Short Path Distillation”; rewritten and expanded November 2026, merging two shorter articles on short-path distillation and on uses of cannabis distillate. We removed an unsourced purity claim and a manufacturer quote, and added references throughout.
Last updated: November 2026.
