Marijuana can be used by smoking, vaping, eating, applying it to the skin, or taking pharmaceutical preparations derived from its active compounds. Each method delivers cannabinoids to your body differently, producing effects that vary in how quickly they start, how intense they feel, and how long they last. The method you choose shapes the entire experience.
Smoking and Vaping
Inhaling cannabis, whether through a joint, pipe, bong, or vaporizer, is the fastest way to feel its effects. Cannabinoids travel from the lungs to the brain almost instantly, with noticeable effects beginning within seconds to minutes. This rapid onset makes it easier to gauge how much you’ve consumed and stop when you’ve reached the desired effect.
Vaping heats cannabis flower or concentrated oil to a temperature that releases cannabinoids as vapor without combustion. Smoking, by contrast, involves burning plant material, which produces not just THC but a range of byproducts: acetaldehyde, ammonia, benzene, carbon monoxide, hydrogen cyanide, and polycyclic hydrocarbons. These combustion chemicals are the same types of toxins found in tobacco smoke. Water pipes don’t eliminate these compounds, and some contaminants like aflatoxins can even survive in bong water for years.
Effects from inhalation typically peak within 15 to 30 minutes and taper off over one to three hours, depending on the potency and how much you consume.
Edibles and Oral Products
Edibles include gummies, chocolates, baked goods, beverages, capsules, and tinctures swallowed rather than held under the tongue. When you eat cannabis, absorption is 30 to 90 minutes slower than inhalation. Blood levels of THC and CBD typically begin to peak around 60 minutes after ingestion, but full effects can take up to two hours to develop.
This delay is the main reason edibles catch people off guard. The common mistake is eating more because you don’t feel anything yet, then experiencing an unexpectedly intense high once everything kicks in at once. Researchers have proposed a standard unit dose of 5 milligrams of THC for any cannabis product. At that level, most people feel psychoactive effects without significant adverse reactions. Many regulated edible products are sold in 5 or 10 milligram portions for this reason.
The body also processes edible THC differently than inhaled THC. After you swallow it, THC travels to the liver, where enzymes convert it into a metabolite called 11-hydroxy-THC. This metabolite is also psychoactive and crosses into the brain efficiently, which is one reason edible highs often feel more potent and longer-lasting than smoking the same amount of THC. The liver then converts 11-hydroxy-THC into an inactive compound that your body eliminates. The entire experience from an edible can last four to eight hours, sometimes longer at higher doses.
Infrequent users tend to report feeling more intensely high from edibles compared to smoking, while frequent users show less of a difference between the two methods.
Topicals and Transdermal Products
Cannabis-infused creams, balms, lotions, and patches are applied directly to the skin. Standard topicals are designed to work locally, targeting soreness or inflammation in the area where you rub them in. Cannabinoids are naturally poor at penetrating skin. They tend to accumulate in the outermost layer and generally do not reach the bloodstream, which means standard topicals won’t produce a high.
Transdermal patches and specially formulated products are a different story. These use penetration enhancers and vasodilators to push cannabinoids through the deeper layers of skin and into capillaries. Until recently, no human study had confirmed that THC or CBD could actually enter systemic circulation through the skin. A pharmacokinetic study using an advanced emulsion-based delivery system was the first to demonstrate measurable blood levels of both compounds from transdermal application. This technology is still relatively new, and most over-the-counter topicals on dispensary shelves are not transdermal.
Sublingual Tinctures and Sprays
Tinctures are liquid cannabis extracts, usually in an alcohol or oil base, placed under the tongue with a dropper. Holding the liquid under your tongue for 30 to 60 seconds allows cannabinoids to absorb through the thin tissue there and enter the bloodstream more directly than swallowing. This partially bypasses the liver’s first-pass metabolism, so effects tend to arrive faster than a typical edible (often within 15 to 45 minutes) while still lasting longer than inhalation.
Oromucosal sprays work on the same principle. One pharmaceutical spray containing both THC and CBD is approved in several countries for multiple sclerosis spasticity, delivering a metered dose to the inside of the cheek.
How THC and CBD Work in the Body
Your body has a built-in signaling network called the endocannabinoid system, with receptors spread throughout the brain, immune cells, liver, skin, and fat tissue. The two main receptor types respond differently. The first type is concentrated in the nervous system, sitting on the tips of nerve cells where it regulates how signals pass between them. This is where THC produces its psychoactive effects: the high, altered perception, appetite stimulation, and pain modulation. THC activates these receptors, though it’s actually a relatively weak activator compared to the cannabinoids your body produces naturally.
The second receptor type is found primarily on immune cells. When activated, it generally reduces inflammation. This is one pathway through which cannabis may help with inflammatory conditions.
CBD doesn’t activate these receptors the way THC does. Instead, it acts as a kind of dimmer switch, reducing how strongly THC and the body’s own cannabinoids can activate the first receptor type. This may explain why cannabis strains higher in CBD tend to produce a less intense high, and why regular use of high-CBD cannabis appears to carry fewer downsides than low-CBD varieties.
The Role of Terpenes
Cannabis contains dozens of aromatic compounds called terpenes that give different strains their distinct smells. The idea that these terpenes modify or enhance the effects of THC and CBD is known as the “entourage effect.” Myrcene, commonly associated with indica-type strains, is linked to relaxation. Limonene, more common in sativa-type strains, has shown anxiety-reducing effects in animal studies at concentrations that produced results comparable to a standard anti-anxiety medication.
The concept is plausible and widely accepted among cannabis users, but clinical verification in humans is still limited. Terpenes are present in cannabis flower in relatively small amounts, so their individual contribution is difficult to isolate.
Medical Uses With Strongest Evidence
Cannabis has the most robust clinical support for neuropathic pain (nerve pain) and muscle spasticity in multiple sclerosis. For neuropathic pain, cannabinoids reduced pain scores by 6 to 9 points on a 100-point scale and nearly doubled the chance of achieving at least a 30% pain reduction. Patients using cannabis for pain also reduced their opioid consumption by roughly 64%, which is significant given the risks of long-term opioid use.
For multiple sclerosis spasticity, an oromucosal THC/CBD spray reduced pain and stiffness by about 1 point on a 10-point scale. The evidence for conditions like fibromyalgia, osteoarthritis, and general musculoskeletal pain remains inconsistent.
It’s worth being realistic about the numbers. Across all pain conditions studied, cannabinoids typically reduced pain by only 4 to 9 points on a 100-point scale, which raises questions about whether the effect is large enough to be meaningful for every patient. The benefit seems most clear for people with nerve-related pain who haven’t responded well to other treatments.
The FDA has approved one cannabis-derived medication (a purified CBD oral solution for certain severe seizure disorders) and three synthetic cannabinoid drugs used primarily for nausea and appetite loss in patients undergoing chemotherapy or living with AIDS.
Effects on Sleep
Short-term cannabis use, particularly THC, tends to help people fall asleep faster, stay asleep longer, and wake up less during the night. It also decreases the amount of time spent in REM sleep (the dream stage) while increasing deep slow-wave sleep. For people whose sleep is disrupted by vivid dreams or nightmares, this shift can feel restorative.
Long-term use tells a different story. Regular cannabis users show increased time to fall asleep, more nighttime waking, and reduced total sleep time. REM sleep remains suppressed, with one study finding regular users averaged only about 17.7% of their sleep in REM, which is below typical levels. Stopping cannabis after regular use often makes sleep temporarily worse, with longer sleep onset and poorer sleep efficiency during the withdrawal period.
Cardiovascular and Cognitive Risks
THC causes an acute, dose-dependent spike in blood pressure and heart rate. Frequent marijuana use is associated with a higher risk of irregular heart rhythms and heart attack. THC also increases tension in blood vessels in the brain, which can reduce cerebral blood flow. These cardiovascular effects are particularly relevant for people with existing heart conditions.
Short-term memory impairment is one of the most consistent cognitive effects of cannabis use. THC disrupts the ability to form new memories while you’re under its influence, and heavy long-term use may extend some cognitive effects beyond the period of intoxication, particularly when use begins in adolescence.
Current Legal Status in the U.S.
Marijuana remains a Schedule I controlled substance under federal law, the most restrictive category. In August 2023, the Department of Health and Human Services recommended moving it to Schedule III, and in May 2024, the DEA proposed a rule to do so. In December 2025, President Trump issued an executive order directing the attorney general to expedite the rescheduling process. The rulemaking is still ongoing. Even if rescheduled to Schedule III, marijuana would still be a federally controlled substance, meaning its manufacture, distribution, and possession without authorization would remain illegal under the Controlled Substances Act. State laws vary widely, with many states permitting medical use, recreational use, or both.