Marijuana can be used in several distinct ways, each with different onset times, durations, and effects on the body. The main methods include smoking, vaping, eating edibles, using tinctures under the tongue, and applying topical products to the skin. Beyond recreational use, cannabis has several FDA-approved medical applications and a growing body of evidence supporting its role in pain management.
Smoking and Vaping
Inhaling cannabis is the most common method and produces the fastest effects. Whether you smoke flower in a joint, pipe, or bong, or vape it through a cartridge or dry herb device, you’ll typically feel the effects within 2 to 10 minutes. The high from smoking or vaping flower generally lasts 1 to 3 hours.
Vaping concentrates (highly potent extracts) works on a similar timeline but can wear off faster, sometimes within 30 minutes to an hour, because the initial dose hits harder and fades quicker. Dabbing, which involves flash-heating a concentrate on a hot surface, produces nearly immediate effects that last 1 to 3 hours for experienced users and potentially longer for beginners.
One key difference between smoking and vaping is how much of the active compound your body actually absorbs. When you smoke cannabis, roughly 10 to 35% of the THC makes it into your bloodstream. Vaping can push that number significantly higher, with some studies finding bioavailability between 50 and 80% for dry herb vaporizers. That means vaping can deliver a stronger effect from the same amount of cannabis, which is worth knowing if you’re switching between methods.
Edibles
Edibles include gummies, chocolates, baked goods, beverages, and capsules. They take much longer to kick in because the cannabis has to pass through your digestive system and get processed by your liver before entering the bloodstream. Expect to wait 30 minutes to 2 hours before feeling anything, though it sometimes takes even longer depending on your metabolism and whether you’ve eaten recently.
The tradeoff for that slow onset is a much longer experience. Edible effects typically last 2 to 10 hours, and high doses can linger up to 24 hours. Your body also absorbs far less THC from edibles, only about 4 to 12% of what you consume, but the liver converts it into a more potent form that produces a stronger, more body-centered high than inhalation.
For first-time users, the standard starting dose is 1 to 2.5 milligrams of THC. This is deliberately low because the delayed onset catches many people off guard. Taking more before the first dose kicks in is the most common cause of an unpleasant experience with edibles.
Tinctures and Sublingual Products
Tinctures are liquid cannabis extracts, usually in an oil or alcohol base, that you place under your tongue using a dropper. Holding the liquid there for 30 to 60 seconds allows the active compounds to absorb through the thin tissue under your tongue and enter the bloodstream more directly than edibles do. Effects typically begin within 15 to 30 minutes and last 4 to 6 hours.
This method sits in a middle ground between smoking and edibles: faster than eating a gummy, longer-lasting than a few puffs. Tinctures also allow precise dosing since you can measure drops, making them popular among people using cannabis for specific symptoms.
Topicals and Transdermal Products
Cannabis-infused creams, balms, lotions, and patches are applied directly to the skin. Standard topicals are designed to work locally without entering the bloodstream, meaning they won’t produce a high. They’re used primarily for localized pain, inflammation, and skin conditions. In animal studies, cannabinoid-infused formulations applied to the skin reached steady-state levels within about 24 hours and maintained them for up to 72 hours, also reducing inflammation in the treated area.
Transdermal patches work differently. They’re specifically engineered to push cannabinoids through the skin barrier into systemic circulation, which means they can produce full-body effects similar to other consumption methods. Cannabinoids don’t appear to be common contact allergens, and early research suggests they may actually help calm allergic skin reactions.
How Cannabis Works in the Body
Your body has a built-in network called the endocannabinoid system that regulates hunger, temperature, alertness, pain, and immune function. The receptors in this system, particularly the ones in the brain (CB1 receptors), outnumber many other receptor types. They act like traffic controllers, turning the activity of other brain chemicals up or down as needed.
THC, the compound responsible for the high, works by hijacking this system. It binds to CB1 receptors in the brain, which is why it affects mood, memory, coordination, and appetite. A second type of receptor, CB2, exists mostly in immune tissue and plays a role in controlling inflammation, particularly in the gut. CBD primarily interacts with CB2 receptors and doesn’t produce a high, which is why it’s being actively studied for anti-inflammatory applications.
Medical Uses With FDA Approval
The FDA has approved a small number of cannabis-derived or cannabis-related medications for specific conditions. Epidiolex, a purified CBD product, is approved for treating seizures associated with Lennox-Gastaut syndrome and Dravet syndrome in patients 2 years and older. These are severe forms of childhood epilepsy that often resist other treatments.
Two synthetic THC products, Marinol and Syndros, are approved for nausea from cancer chemotherapy and for appetite loss and weight loss in AIDS patients. A third synthetic, Cesamet, is also approved for chemotherapy-related nausea. These medications contain lab-made versions of THC rather than plant-derived cannabis.
Cannabis for Chronic Pain
Pain management is the most common reason people seek medical cannabis. Low back pain is the leading complaint, accounting for about 56% of patients seeking certification, followed by neck and extremity pain.
The evidence is mixed but generally positive. Some studies have found that CBD can reduce chronic pain by 42 to 66%. A 12-week clinical trial found over 55% pain reduction with THC-containing formulations, with the strongest results in fibromyalgia patients. However, a large 2018 analysis of over 100 studies involving nearly 10,000 patients painted a more modest picture: 29% of patients using cannabinoids achieved at least a 30% reduction in pain, compared to 26% on placebo.
Where cannabis shows particular promise is in reducing opioid dependence. In one study of 40 patients with osteoarthritis pain, daily opioid use dropped by nearly half within six months of starting medical cannabis, and 38% stopped using opioids entirely. Other research has found cannabinoids can lower opioid requirements by as much as 75 to 96% for certain medications.
Side Effects and Risks
Cannabis directly affects the parts of the brain responsible for memory, learning, attention, decision-making, coordination, and reaction time. These effects are most pronounced while high but can persist with heavy, long-term use.
Cardiovascular effects are also well documented. Cannabis can raise heart rate and blood pressure immediately after use, and regular use is associated with increased risk of stroke, heart disease, and other vascular problems. In clinical pain studies, adverse events were notably more common among patients using cannabinoids (81%) than those on placebo (66%), though most side effects were mild, such as dizziness, dry mouth, and drowsiness.
The method of use also carries its own risks. Smoking cannabis exposes the lungs to combustion byproducts. Edibles carry the risk of accidental overconsumption because of their delayed onset. And the potency of concentrates used in dabbing or vape cartridges can quickly exceed a comfortable dose for inexperienced users.