CBD vs THC is the comparison behind nearly every cannabis label in Michigan. Both are cannabinoids made by the same plant, and they even share a chemical formula. The key difference between CBD and THC is that THC produces a high and CBD doesn't. They also differ in legal status, side effects and how they show up on drug tests. Here's a plain-language comparison.
Where CBD and THC come from
THC and CBD are the main cannabinoids in cannabis, out of more than 100 that scientists have identified. The plant first makes acid forms, THCA and CBDA, which turn into THC and CBD when heated.
Hemp and marijuana are the same species. What separates them is THC content: hemp is grown to stay very low in THC, often for CBD, fiber or seed, while marijuana is grown for THC. Under Michigan law, cannabis with more than 0.3% THC, counting THCA, is marijuana. Our label-reading guide shows where to find both numbers.
Same formula, different shape: CBD vs THC at CB1 and CB2
Both molecules are built from the same atoms, 21 carbons, 30 hydrogens and 2 oxygens, arranged differently. THC has a closed ring where CBD's is open, and that small difference changes how each one fits the body's receptors.
The endocannabinoid system relies on two main cannabinoid receptors. Most CB1 receptors are in the brain and spinal cord, where they influence movement, thinking and memory. CB2 is found mainly on immune cells and on nerve endings outside the brain.
- THC activates CB1, and that's what produces the high.
- CBD has very low activity at CB1, which helps explain why it isn't intoxicating. It can even dampen CB1 signaling, and it acts on many other targets in the body.
Our primer on what THC is covers THC's effects in more depth.
How each feels: THC vs CBD effects
THC is intoxicating. Depending on the dose and the person, it can bring euphoria and relaxation, shift your sense of time, sharpen your appetite and slow your reactions. Too much can bring anxiety or paranoia, and cannabis use has been linked to a higher risk of car crashes, so never drive after using it.
CBD doesn't produce a high. It isn't inert, though: it can lower alertness, change mood and appetite, and upset the stomach. If you're curious how “non-intoxicating” differs from “non-psychoactive,” see our explainer on whether CBD is psychoactive.
What CBD and THC share: formats and ways to consume
Both come in the same formats: flower, vapes, tinctures and oils, edibles, capsules and topicals. Many products contain both, either naturally or in a set ratio.
How you take them changes the timing. With CBD, for example, inhaled forms reach the blood fastest, while edibles take longer to absorb but can still build to meaningful levels. Topicals may not put much into the bloodstream at all, though there's little data on how much gets through. Our CBD types explainer breaks down full-spectrum, broad-spectrum and isolate products.
Legal status: hemp CBD vs state-regulated THC in Michigan
Federal law set hemp's limit in 2018 at 0.3% delta-9 THC, measured by dry weight. That took hemp off the federal controlled substances list and opened the door to hemp CBD nationwide. A narrower federal definition that counts total THC, including THCA, is set to take effect in late 2026, as of October 2026, and further changes are possible.
Michigan's line also sits at 0.3%, but it counts THCA. Cannabis with 0.3% THC or less is industrial hemp, and anything above that is marijuana, which only licensed marijuana businesses may sell. That's why CBD products whose THC goes over that line are sold only in licensed stores. At High Society, you can shop recreationally from age 21, or from 18 with a medical card. Please don't travel across state lines with cannabis.
Side effects and drug interactions worth knowing
THC. Short-term impairment and a higher risk of car crashes come first. Some people who use cannabis develop cannabis use disorder, and frequent use has been linked to a higher risk of psychotic illness in people predisposed to it. Smoking cannabis during pregnancy has been linked to lower birth weight.
CBD. Drowsiness, mood changes, decreased appetite and diarrhea are the common ones. CBD has also been associated with liver injury and male reproductive harm. NIH's integrative health center adds that it may cause psychotic effects or cognitive problems in people who also use THC regularly.
Interactions. CBD can interfere with liver enzymes that break down many drugs, leaving too much or too little medicine in your system. Potentially serious interactions include the blood thinner warfarin, the heart rhythm drug amiodarone, the thyroid medicine levothyroxine and several seizure medicines. Taking CBD with opioids, benzodiazepines, sedating antihistamines or alcohol can add to drowsiness.
Pregnant or breastfeeding, taking any medicine, or managing liver problems? Check with your clinician or pharmacist before using either cannabinoid.
What research and FDA approvals show
The clearest evidence for both cannabinoids comes from prescription drugs that went through FDA review:
| Medicine | Active ingredient | Approved for |
|---|---|---|
| Epidiolex | Purified CBD | Seizures in Dravet syndrome, Lennox-Gastaut syndrome or tuberous sclerosis complex (ages 1 and up) |
| Marinol and Syndros | Dronabinol, a synthetic form of delta-9 THC | Appetite loss with weight loss in people with AIDS, and nausea and vomiting from chemotherapy |
| Cesamet | Nabilone, a lab-made compound similar to THC | Nausea and vomiting from chemotherapy |
Those approvals cover specific products at controlled doses. They don't carry over to dispensary or over-the-counter products, which haven't been through that review. For most other conditions, research on cannabis and cannabinoids is still in its early stages, according to NIH.
Using CBD and THC together: ratios and the entourage idea
Ratio labels show the balance of the two by milligrams:
- 20:1: mostly CBD, with a small amount of THC
- 1:1: equal milligrams of each
- 1:2 and up: THC-forward
The ratio doesn't tell you strength. A 1:1 gummy with 5 mg of each is very different from one with 10 mg of each, and the THC milligrams decide how intoxicating a product is. Some people believe CBD softens THC's edge. Others point to the entourage effect, which holds that cannabis compounds work better as a team. Both ideas are still debated, and our guide to the entourage effect walks through the evidence.
CBD vs THC drug test: what shows up
Workplace drug screens hunt for a THC breakdown product; CBD isn't what they're built to find. That's good news for pure CBD, with a catch.
In a controlled 2020 study, six healthy adults received 100 mg of pure CBD, swallowed or vaporized. Only 1 of 218 urine samples screened positive at the most sensitive setting, and none came back positive on the lab's follow-up test. After the same people vaped CBD-dominant cannabis with just 3.7 mg of THC, four samples tested positive on both the screen and the follow-up test.
The catch is labeling: over-the-counter CBD can contain more or less CBD than stated, plus THC that isn't on the label. If you're tested, choose products with a batch lab report, and remember that a few milligrams of THC were enough in that study. How long THC stays detectable also hinges on your dose and how often you use.
