What is cannabis? It is a flowering plant that people use for medical, recreational, and personal wellness reasons. More than 100 active chemicals known as cannabinoids live in its resin. The two you need to know are THC and CBD.
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Cannabis includes Cannabis sativa, Cannabis indica, and endless hybrids. Under U.S. federal law, hemp is a cannabis plant with no more than 0.3 percent THC by dry weight. That legal detail separates federally legal hemp stores from state-licensed cannabis shops.
What exactly is cannabis?
At the biological level, cannabis is an annual herb that belongs to the Cannabaceae family. It grows quickly, sometimes reaching over 10 feet in a single season outdoors. Female plants develop resinous buds, and those buds are the part most people use.
Freshly dried cannabis flower is easy to identify by look and smell. The buds are covered with tiny resin glands, called trichomes, that hold most of the active chemicals. Growers and breeders have created hundreds of cultivars to produce specific aromas, colors, and effects, often called sativa, indica, or hybrid strains.
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How does cannabis work inside your body?
Your body makes its own cannabis-like molecules, called endocannabinoids. These molecules bind to receptors that help regulate sleep, appetite, pain, mood, and memory. Plant cannabinoids fit into the same receptor system, which is why effects can be so broad.
THC binds strongly to CB1 receptors in the central nervous system. CBD interacts with other receptor types and can change how THC acts. The balance of these compounds determines much of your experience.
What are the main active compounds in cannabis?
When people ask what is cannabis, they usually want to know about THC and CBD first. Both come from the same plant but behave differently. Here is a quick look at the major players:
- THC, or delta-9-tetrahydrocannabinol, is the compound that creates a high. It can also ease pain, boost appetite, and cause anxiety at higher doses.
- CBD, or cannabidiol, does not make you feel intoxicated. It is used for pain, anxiety, and seizure disorders, but the FDA has not approved it as a general supplement.
- Minor cannabinoids like CBG and CBN are growing in popularity, and terpenes shape the aroma and may modify effects.
Lab testing tells you how much of each compound is in a product. Legal stores in the U.S. must show certificate of analysis results that list THC, CBD, and contaminants.
What does cannabis feel like after use?
Effects vary by person, product, dose, and your mindset at the moment. Low doses often feel relaxing and uplifting. Higher doses can be heavy, disorienting, or sedating.
- Common felt effects include euphoria, relaxation, laughter, and increased appetite.
- Some people feel sleepy, introspective, or more sensitive to music and taste.
- Negative responses, especially with too much THC, may include racing heart, nausea, dry mouth, anxiety, and paranoia.
Those negative effects usually pass within a few hours. Start with a low dose, especially if you are new to cannabis.
What different cannabis products can you buy?
Legal shops sell cannabis in more forms than simple dried flower. The product you choose changes how quickly effects start and how long they last.
- Dried flower is smoked or vaporized. Effects begin within minutes and usually last 1 to 3 hours.
- Vape cartridges contain extracts that are heated in a battery device. They work quickly, but quality varies by manufacturer.
- Edibles, such as gummies and chocolate, are processed by your liver. Onset can take 30 minutes to 2 hours or more, and effects often last 6 to 8 hours.
- Concentrates like wax, shatter, and live resin are very high in THC. They need special tools and expertise.
- Tinctures are liquid extracts you place under the tongue. They offer a middle ground between flower and edibles in onset speed and duration.
Store staff can walk you through each form. For first-time buyers, low-THC edibles or CBD-balanced flower are sensible starting points.
How are medical and recreational cannabis different?
Medical cannabis is recommended by a healthcare provider to manage a specific condition. Users often get products with higher CBD or tailored terpene profiles, and some states have separate medical programs with more generous possession limits.
Recreational cannabis is sold to adults aged 21 and older in states that allow adult use. There is no medical reason required, and stores typically focus on THC potency and flavor rather than condition-specific therapy.
Some states only allow medical cannabis. Before assuming a product is available near you, check that state's law and your local regulations.
Is cannabis legal in the United States?
The legal landscape is complicated. Under federal law, cannabis remains a Schedule I controlled substance, but many states have passed their own laws permitting medical or adult use.
As of 2025, 24 states plus Washington, D.C. have legalized recreational cannabis, and most states allow some form of medical cannabis program. Federal enforcement policies have shifted under different administrations, so national law can feel uncertain even in legal states.
In licensed stores, transactions are cash-heavy because many banks avoid cannabis money. Buy only from state-regulated shops to make sure the product has been tested and labeled.
What are the risks and side effects of cannabis?
Cannabis is not without downsides. Smoking anything, including flower, can irritate your lungs, so many people choose vaporizers or edibles instead.
- Short-term risks include anxiety, paranoia, panic, memory problems, and a fast heart rate.
- Regular heavy use has been linked to cannabis use disorder, a real condition that affects about 10 percent of adults who use it.
- Underage use can affect attention, learning, and brain development, which is why legal markets enforce strict age limits.
- Driving under the influence of cannabis is illegal and impairs reaction time and judgment.
If you have heart disease, a history of psychosis, or are pregnant, avoiding cannabis is the safer choice. Talk with a healthcare provider rather than guessing.
Frequently asked questions about cannabis
What is the difference between sativa and indica?
Traditional wisdom says sativas feel uplifting and energizing, while indicas feel relaxing and sedating. Modern hybrids make those labels less reliable, and terpenes and THC content often matter more than strain name.
Does cannabis cause a positive drug test?
Yes. Most urine and hair drug tests look for THC metabolites, not CBD or hemp-derived compounds. Even if you only use a low-THC product once, it can stay detectable for weeks after regular use.
Can you overdose on cannabis?
You cannot die from a cannabis overdose in most cases, but you can have an extremely unpleasant experience called cannabis toxicity. Symptoms include severe nausea, panic, and vomiting. If this happens, rest and stay hydrated unless symptoms become severe, then seek medical help.
The bottom line on cannabis
Cannabis is one plant, but it is not one single experience. Product type, dose, and your body chemistry all affect how it works. Start low, go slow, and always buy from state-regulated sources to get lab-tested products.
Now that you have an answer to what is cannabis, you can walk into a shop prepared. Ask for lab reports, talk with the staff, and be honest about your tolerance. Good guidance makes the difference between a useful experience and an uncomfortable one.