THC alone and THC together with other cannabinoids do not necessarily feel the same, but the evidence is limited: THC is the compound that causes the “high,” and a few studies suggest that CBD may partly offset some of its effects. The effect you get from any cannabis product depends mainly on the amount of THC, the way you take it, and your own tolerance and health, not on a single ingredient. This page explains what THC does, what the other cannabinoids are, and what is and is not proven.
People often ask whether a pure THC product is different from whole-plant cannabis that contains CBD, CBN, terpenes and other compounds. The idea that the plant’s compounds work better together is popular and sometimes called the “entourage effect.” This guide sticks to what authoritative sources say, is plain about what is uncertain, and gives practical advice for choosing a product. It is general information for adults, not medical advice.
THC and Other Cannabinoids at a Glance
| Question | Short answer | Source |
|---|---|---|
| What causes the high? | THC (tetrahydrocannabinol), which has intoxicating, mind-altering effects | NIDA |
| What is CBD? | A non-intoxicating cannabinoid in the plant | NIDA |
| Does CBD change THC’s effects? | May partly offset some effects; evidence limited | Published review |
| How are cannabinoids absorbed? | Inhaled peaks in 2 to 10 minutes; eaten peaks in 1 to 6 hours | NCI PDQ |
| Is cannabis an approved medicine? | Not for any condition; some cannabinoid drugs are FDA approved | NCI PDQ |
What Are Cannabinoids?
Cannabinoids are the chemical compounds in the cannabis plant that act on receptors in the body. The National Cancer Institute explains that these components activate specific receptors throughout the body to produce effects, particularly in the central nervous system and the immune system. The first cannabinoid receptor, CB1, was identified in the brain in 1988, and a second, CB2, in 1993. The body also makes its own cannabinoids, called endocannabinoids, which appear to play roles in pain, movement, feeding, mood, inflammation and memory.
The two cannabinoids most people know are:
- THC: the main intoxicating compound. NIDA says cannabis products with THC can cause changes in mood, thoughts and perceptions of reality.
- CBD (cannabidiol): NIDA calls it a non-intoxicating cannabinoid, and the NCI calls it nonpsychoactive. CBD products are marketed for many uses, but the evidence for most of them is limited. Our CBD guide covers what is known.
The plant contains many other cannabinoids and aromatic compounds, but we do not make claims about them here, since the human evidence is thin.
What Are the Effects of THC?
NIDA lists the short-term effects of cannabis with THC: feeling happier or more relaxed, altered time perception, and impaired thinking, memory and body movement. Some people feel irritable or restless. Increased appetite is commonly reported, and cannabis may help manage nausea or vomiting related to chemotherapy. Anxiety, fear, distrust, panic or hallucinations are more common when someone takes a large amount, uses a strong product, or has little experience. An elevated heart rate and respiratory problems are other possible effects, and the CDC says high-THC products raise the risk of overdose or poisoning.
How strong the effect feels depends on several things, per NIDA: the amount, the potency, the product’s ingredients, how it is taken, other drugs in the person’s system, underlying medical conditions, age, sex, genetics and past experience with cannabis.
Does THC Feel Different With Other Cannabinoids?
This was the question in the old BBC video that this page once linked: how does THC on its own compare with THC in a mix that resembles real cannabis? The honest answer is that the evidence is limited and mixed.
- CBD and THC: a peer-reviewed review of dosing, which proposed a standard 5 mg THC unit, notes that CBD may partly offset some THC effects. This is a reason some people choose products with both compounds, but it does not mean CBD removes the risks of THC.
- Approved products: the NCI notes that nabiximols, a cannabis extract with a 1:1 ratio of THC to CBD, is approved in Canada for symptomatic relief of pain in advanced cancer and multiple sclerosis, and approved in several other countries for spasticity in multiple sclerosis. It is not an FDA-approved U.S. medicine.
- The “entourage effect”: the idea that all the plant’s compounds amplify each other. We did not find strong human evidence from authoritative sources, so we treat it as unproven rather than established.
In practice, a lab-tested label showing THC and CBD percentages is a better guide than marketing terms.
How the Method Changes the Effect
The NCI reports that inhaled cannabinoids reach peak concentration in about 2 to 10 minutes and decline over roughly 30 minutes, with less of the potent 11-OH-THC metabolite. Eaten cannabis has low, variable bioavailability (about 6% to 20%), peaks 1 to 6 hours after ingestion, and the liver converts THC to 11-OH-THC. This is why the same milligrams of THC feel different in a joint and a gummy, and why edibles surprise people. See our dosage guide for practical advice.
Concentrates deliver more THC more quickly. NIDA says concentrates in dispensaries can have THC above 40% and that dabbing can rapidly deliver large amounts of THC. Read our dabbing guide before trying them.
Risks of THC
- Driving: cannabis is the drug most frequently found in the blood of drivers in crashes, NIDA says. Do not drive after using. Washington treats 5 ng/mL of active THC in the blood as a per se DUI.
- Cannabis use disorder: estimated at 22% to 30% of people who use cannabis, and higher THC concentrations are associated with a greater likelihood of it.
- Mental health: NIDA reports evidence linking cannabis use to earlier onset of psychosis in people with genetic risk factors.
- Pregnancy: linked to lower birth weight and preterm birth.
- Tolerance: the NCI says the brain develops tolerance, and NIDA lists tolerance and withdrawal among symptoms of cannabis use disorder.
Be careful with fake cannabinoids. Products sold as “Spice” or “K2” are not cannabis; see our K2 and Spice guide.
Choosing a Product
- Pick licensed, lab-tested products and read both THC and CBD amounts.
- If you want a milder experience, a lower-THC product or a THC and CBD blend may suit you, but start with a small dose either way.
- Wait before taking more: two hours for edibles, a few minutes for inhaled products.
Browse licensed stores in our Washington and Oregon directories, read about local rules in our Washington guide, and find more in Cannabis 101.
THC and Cannabinoids FAQ
What does THC do to you?
It causes the high: changes in mood, perception and time sense, impaired memory and coordination, and sometimes anxiety. NIDA says effects depend on dose, potency, method and the person.
Is THC alone stronger than THC with CBD?
Possibly in some respects. A published review notes CBD may partly offset some THC effects, but the evidence is limited and results vary.
What is the difference between THC and CBD?
THC is intoxicating. CBD is not, according to NIDA. They act differently in the body.
What is the entourage effect?
The theory that cannabinoids and terpenes work better together. We did not find strong evidence in authoritative sources, so we call it unproven.
How long do THC effects last?
Inhaled THC peaks in about 2 to 10 minutes and declines over roughly 30 minutes, while eaten THC peaks 1 to 6 hours after ingestion, per the NCI. Impairment can outlast the peak.
Is THC safe?
It has real risks, including impaired driving, anxiety and cannabis use disorder. Adults who use it should start low and avoid driving.
For adults 21+ in legal states. General information, not medical advice. Talk to a doctor before using cannabis for a health condition.
