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Cannabis Science
What Are Cannabinoids? Complete Guide
Cannabinoids are a class of over 100 chemical compounds produced by the cannabis plant (Cannabis sativa) that bind to cannabinoid receptors in the human body to produce physiological and psychoactive effects. The most abundant cannabinoid in most cannabis cultivars is delta-9-tetrahydrocannabinol (THC), which typically comprises 15–30% of dried flower weight in modern strains. The second most studied is cannabidiol (CBD), which can range from less than 1% to over 20% depending on the cultivar.
These compounds are synthesized in the trichomes of the cannabis plant as carboxylic acids , THCA, CBDA, CBGA , and convert to their neutral, active forms through heat in a process called decarboxylation. This distinction between raw acidic cannabinoids and heat-activated neutral cannabinoids is the single most important variable in cannabis preparation.
The Major Cannabinoids
Cannabis produces cannabinoids through a biosynthetic pathway that starts with cannabigerolic acid (CBGA), which enzymatic reactions then convert into THCA, CBDA, and CBCA. Each cannabinoid has a distinct mechanism of action, receptor affinity, and boiling point that determines how it behaves during extraction and consumption.
THC , Delta-9-Tetrahydrocannabinol
THC is the primary psychoactive cannabinoid in cannabis. It binds as a partial agonist to CB1 receptors concentrated in the brain and central nervous system, producing euphoria, altered time perception, appetite stimulation, and analgesic effects. THC boils at 157°C (315°F), making it one of the first cannabinoids to vaporize during heating. Typical concentration in modern cannabis flower ranges from 15% to 30% by dry weight.
CBD , Cannabidiol
CBD is a non-psychoactive cannabinoid that does not bind directly to CB1 or CB2 receptors in the way THC does. Instead, it acts as a negative allosteric modulator of CB1, reducing the binding efficiency of THC, which is why high-CBD strains produce a less intense psychoactive experience. CBD also interacts with serotonin 5-HT1A receptors and TRPV1 vanilloid receptors. Its boiling point is 160–180°C (320–356°F). Concentrations in CBD-dominant cultivars reach 15–25%.
CBN , Cannabinol
CBN is not produced directly by the plant in significant quantities. It forms through the oxidative degradation of THC when cannabis is exposed to light, heat, and air over time. CBN is mildly psychoactive , roughly 10% the potency of THC at CB1 receptors , and is associated with sedative effects, though this sedation likely results from the combined terpene profile of aged cannabis rather than CBN alone. Boiling point: 185°C (365°F). Old, poorly stored cannabis typically contains elevated CBN and reduced THC.
CBG , Cannabigerol
CBG is the non-acidic form of CBGA, the precursor molecule from which all other cannabinoids are synthesized. In most mature cannabis plants, CBG concentrations are below 1% because CBGA has already been converted to THCA, CBDA, or CBCA. Breeders have developed CBG-dominant cultivars that contain up to 15% CBG by interrupting this conversion pathway through harvest timing and genetic selection. CBG binds weakly to both CB1 and CB2 receptors and also acts as an antagonist at 5-HT1A receptors. Boiling point: 52°C (126°F) for the crystalline isolate, though in plant matrix it typically vaporizes at higher effective temperatures around 170°C (338°F). CBG is non-psychoactive.
CBC , Cannabichromene
CBC is the third most abundant cannabinoid in many cultivars, though rarely exceeding 1–2% in finished flower. It derives from CBCA via decarboxylation and does not bind significantly to CB1 receptors, making it non-psychoactive. CBC interacts with TRPV1 and TRPA1 receptors (transient receptor potential channels), which are involved in pain and inflammation signaling. Boiling point: 220°C (428°F), the highest of the major cannabinoids, meaning it survives lower-temperature extraction methods and concentrates in residual plant material.
THCA , Tetrahydrocannabinolic Acid
THCA is the acidic precursor to THC and the dominant cannabinoid in raw, unheated cannabis flower. It is non-psychoactive because its three-dimensional molecular shape prevents it from fitting into CB1 receptors. THCA converts to THC through decarboxylation, which occurs at approximately 105°C (220°F) over 30–45 minutes or at lower temperatures over longer periods. When a lab result shows 25% THCA, the maximum possible THC after full decarboxylation is approximately 21.9% (THCA × 0.877, the molecular weight conversion factor accounting for the loss of a CO2 molecule).
CBDA , Cannabidiolic Acid
CBDA is the acidic precursor to CBD, present in raw cannabis and hemp flower. Like THCA, it does not produce psychoactive effects. CBDA has demonstrated higher affinity for serotonin 5-HT1A receptors than CBD in preclinical studies , up to 100 times greater binding affinity in some in-vitro models. Decarboxylation of CBDA to CBD occurs at approximately 120°C (248°F) over 60–90 minutes, a slightly higher temperature and longer duration than THCA-to-THC conversion. The molecular weight conversion factor is 0.877, identical to the THCA-to-THC ratio.
The Endocannabinoid System
Cannabinoids produce effects in the human body because humans have an endogenous cannabinoid system , the endocannabinoid system (ECS) , that was present long before anyone consumed cannabis. The ECS was identified in 1992 by researchers Raphael Mechoulam and William Devane at Hebrew University in Jerusalem. It consists of three components: endocannabinoids (molecules your body produces), receptors (proteins on cell surfaces), and enzymes (which synthesize and break down endocannabinoids).
CB1 Receptors
CB1 receptors are the most abundant G-protein-coupled receptors in the mammalian brain. They are concentrated in the cerebral cortex, basal ganglia, hippocampus, and cerebellum , regions responsible for cognition, movement, memory, and coordination. When THC binds to CB1 receptors as a partial agonist, it produces the psychoactive effects associated with cannabis: euphoria, time distortion, short-term memory impairment, and appetite stimulation. CB1 receptors also exist in peripheral tissues including the liver, adipose tissue, and gastrointestinal tract.
CB2 Receptors
CB2 receptors are concentrated in immune system tissues: the spleen, tonsils, bone marrow, and white blood cells. They are present in the brain at much lower densities than CB1 receptors. Activation of CB2 receptors modulates immune response and inflammatory signaling. CBG and CBD both interact with CB2 receptors, though neither is a strong agonist. Beta-caryophyllene, a terpene found in cannabis, black pepper, and cloves, also selectively activates CB2 receptors.
Anandamide (AEA)
Anandamide is an endogenous cannabinoid , a molecule your body produces that binds to CB1 receptors. Its name comes from the Sanskrit word “ananda,” meaning bliss. Anandamide is a partial agonist at CB1 and a weak partial agonist at CB2. It is produced on demand from membrane phospholipids (not stored in vesicles) and broken down rapidly by the enzyme fatty acid amide hydrolase (FAAH). Anandamide’s half-life in the body is measured in minutes, which is why its effects are short-lived compared to THC. CBD inhibits FAAH, slowing anandamide breakdown and effectively increasing its concentration at receptor sites.
2-Arachidonoylglycerol (2-AG)
2-AG is the most abundant endocannabinoid in the human body, present at concentrations roughly 170 times higher than anandamide in the brain. It is a full agonist at both CB1 and CB2 receptors, making it more potent at each receptor site per molecule than anandamide. 2-AG is synthesized by diacylglycerol lipase (DAGL) and degraded primarily by monoacylglycerol lipase (MAGL). It plays a central role in retrograde signaling: when a postsynaptic neuron is overstimulated, it releases 2-AG, which travels backward across the synapse to bind CB1 on the presynaptic neuron, reducing neurotransmitter release. This is the fundamental mechanism through which the ECS regulates neural homeostasis.
Decarboxylation: Raw vs. Heated Cannabis
Raw cannabis flower contains cannabinoids almost entirely in their acidic forms: THCA, CBDA, CBGA. These acidic cannabinoids do not bind efficiently to CB1 receptors, which means raw cannabis does not produce psychoactive effects. Eating raw cannabis flower , even a large quantity , will not get you high. This is the single fact that separates functional cannabis preparation from wasted material.
Decarboxylation is the chemical reaction that removes a carboxyl group (COOH) from the cannabinoid molecule, releasing CO2 and converting THCA to THC, CBDA to CBD, and CBGA to CBG. The reaction is driven by heat and time. At 105–110°C (220–230°F), THCA converts to THC in approximately 30–45 minutes. At lower temperatures , 90°C (194°F) , the same conversion takes 60–90 minutes. Above 150°C (302°F), THC itself begins to degrade into CBN, meaning over-decarboxylation destroys the compound you are trying to activate.
This is why temperature precision matters in cannabis preparation. A slow cooker fluctuates by 10–20°C. An oven cycles by 5–15°C depending on calibration. A precision decarboxylation device holds temperature to ±1°C, which means the difference between full activation and partial degradation. In practical terms: at 110°C for 40 minutes, properly decarboxylated cannabis retains 95–100% of its potential THC. At 130°C for the same duration, 10–15% has already degraded to CBN.
For preparations that benefit from acidic cannabinoids , raw cannabis juicing, THCA tinctures, CBDA-rich topicals , the goal is the opposite: avoid heat entirely, or keep temperatures below 70°C (158°F) to preserve the carboxylic acid group.
Cannabinoid Comparison
| Cannabinoid | Boiling Point | Psychoactive | Receptor Affinity | Key Effects | Found In |
|---|---|---|---|---|---|
| THC | 157°C / 315°F | Yes | CB1 partial agonist | Euphoria, appetite stimulation, analgesia, altered perception | Most cannabis cultivars at 15–30% |
| CBD | 160–180°C / 320–356°F | No | CB1 negative allosteric modulator, 5-HT1A, TRPV1 | Anxiolytic, anti-inflammatory, modulates THC intensity | CBD-dominant cultivars at 15–25% |
| CBN | 185°C / 365°F | Mildly (10% of THC potency) | CB1 weak partial agonist, CB2 | Sedation (likely terpene-synergistic), mild psychoactivity | Aged/oxidized cannabis, typically <1% |
| CBG | ~170°C / 338°F (in plant matrix) | No | CB1 and CB2 weak, 5-HT1A antagonist | Under research; non-intoxicating precursor molecule | Most cultivars <1%; CBG cultivars up to 15% |
| CBC | 220°C / 428°F | No | TRPV1, TRPA1 agonist; minimal CB1 | Anti-inflammatory signaling via TRP channels | Most cultivars at 0.1–2% |
| THCA | Converts at 105°C / 220°F (decarbs, does not boil) | No | Does not fit CB1 binding pocket | Non-psychoactive; raw cannabis compound; converts to THC with heat | Raw flower at 15–30% (dominant form before heating) |
| CBDA | Converts at 120°C / 248°F (decarbs, does not boil) | No | 5-HT1A (up to 100x affinity vs. CBD in vitro) | Non-psychoactive; higher serotonin receptor affinity than CBD | Raw CBD-dominant flower at 15–25% |
Practical Application: How This Knowledge Affects Preparation
Every cannabis preparation method is, at its core, a decision about which cannabinoids to activate, preserve, or destroy. Understanding boiling points and decarboxylation thresholds determines the outcome of your batch.
Edibles and Infusions
Cannabis butter and infused oils require full decarboxylation before or during infusion. If you skip decarboxylation and infuse raw flower directly into oil at 85°C (185°F), you will extract THCA , not THC , and the result will be non-psychoactive. The correct sequence: decarboxylate at 110°C for 40 minutes, then infuse into fat at 85°C for 2–4 hours. Alternatively, a single-step process at 100–110°C in oil for 3–4 hours achieves both decarboxylation and infusion simultaneously, though with less precision.
Vaporization
Vaporizers that operate between 157°C and 220°C allow selective cannabinoid extraction. At 157°C, THC vaporizes first. At 180°C, CBD joins the vapor. At 220°C, CBC releases. This is why low-temperature vaping produces a more cerebral, THC-dominant effect, while high-temperature vaping feels heavier and more sedating , the full cannabinoid and terpene spectrum is being extracted.
FECO and Ethanol Extraction
Full Extract Cannabis Oil (FECO) uses food-grade ethanol to dissolve all cannabinoids, terpenes, flavonoids, and plant waxes. Because ethanol extraction happens at or below room temperature, no decarboxylation occurs during the soak. FECO must be decarboxylated either before extraction (decarb the flower first) or after (heat the finished oil to 110°C). Skipping this step results in a full-spectrum but non-psychoactive extract dominated by THCA and CBDA.
Topicals and Non-Psychoactive Preparations
For topicals applied to the skin, psychoactivity is irrelevant because cannabinoids in topical application do not reach the bloodstream in significant quantities. Both THCA and THC can be used. Raw (non-decarboxylated) cannabis in a topical base preserves the acidic cannabinoid profile, which some users prefer for localized application. CBDA-rich hemp flower processed without heat produces a topical with high serotonin receptor affinity compounds intact.
Frequently Asked Questions
How many cannabinoids are in the cannabis plant?
The cannabis plant produces over 100 identified cannabinoids. The most abundant in typical cultivars are THCA (15–30% in THC-dominant strains), CBDA (15–25% in CBD-dominant strains), and CBGA (usually under 1% in mature plants). Minor cannabinoids include CBC, CBN, THCV, CBDV, and delta-8-THC, each typically present at less than 1–2% of dry flower weight.
What is the difference between THC and THCA?
THCA is the acidic precursor to THC found in raw, unheated cannabis. THCA is non-psychoactive because its molecular shape does not fit the CB1 receptor binding pocket. When heat is applied , at approximately 105°C (220°F) for 30–45 minutes , THCA loses a carboxyl group (COOH) as CO2 and converts to THC, which is psychoactive. The conversion factor is 0.877: multiply THCA percentage by 0.877 to calculate maximum possible THC after decarboxylation.
What temperature destroys cannabinoids?
THC begins to degrade into CBN above 150°C (302°F) with extended exposure. At 200°C (392°F), degradation accelerates significantly , a 10-minute exposure at this temperature can destroy 15–20% of available THC. CBD is more thermally stable than THC and tolerates temperatures up to 200°C before meaningful degradation begins. For decarboxylation, the optimal range is 105–120°C (220–248°F). Keeping temperatures within ±1°C of target prevents both under-activation (THCA remaining unconverted) and over-degradation (THC converting to CBN).
Does CBD counteract the effects of THC?
CBD modulates THC activity rather than blocking it outright. CBD acts as a negative allosteric modulator at CB1 receptors, changing the receptor shape so THC binds less efficiently. This reduces , but does not eliminate , THC’s psychoactive intensity. A cannabis product with a 1:1 THC-to-CBD ratio produces noticeably less psychoactive intensity than the same amount of THC alone. A ratio of 1:2 or higher (more CBD than THC) further attenuates psychoactivity while allowing other THC effects to persist.
What cannabinoids are best for edibles?
For psychoactive edibles, THC is the primary target , achieved by fully decarboxylating THCA before or during infusion. When THC is metabolized orally, the liver converts it to 11-hydroxy-THC, which crosses the blood-brain barrier more efficiently and produces stronger, longer-lasting effects than inhaled THC. For non-psychoactive edibles, CBD (from decarboxylated CBDA) is the standard. Full-spectrum preparations that retain minor cannabinoids (CBG, CBC, CBN) and terpenes through controlled temperature processing produce what is commonly described as the entourage effect , the combined pharmacological activity of multiple cannabis compounds acting together.
The NOIDS Herb Lab holds decarboxylation and infusion temperatures to ±1°C across the full cycle , from decarb at 110°C through oil infusion at 85°C. One device. Five functions. The cannabinoid knowledge above becomes repeatable yield in your kitchen. noids.co
This article provides cannabis science and preparation knowledge. Cannabinoid research is ongoing, and specific effects vary by individual, dose, cultivar, and preparation method. Cannabis legality varies by jurisdiction. This content does not constitute medical advice. Verify the legal status of cannabis in your location before preparing cannabis products.
Last reviewed: April 2026
This process can be performed with the NOIDS Herb Lab.
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