A 10mg THC edible and a 10mg puff from a vaporizer contain the same amount of THC. They do not produce the same experience. The edible will hit harder, last longer, and feel qualitatively different — and the reason has nothing to do with the cannabis strain or the product quality. It has to do with pharmacology: how your body processes THC depends entirely on the route of administration.
Understanding these differences is not optional for informed cannabis consumption. It is the difference between a comfortable experience and a trip to the emergency room — and it explains why edibles send more people to the ER than any other cannabis product category despite containing precisely controlled doses.
Inhalation: Smoking and Vaping
When you smoke or vape cannabis, THC crosses from the lungs into the bloodstream within seconds. Peak plasma THC concentrations occur within 3 to 10 minutes. Bioavailability — the percentage of consumed THC that actually reaches your bloodstream — ranges from 10% to 35%, depending on inhalation technique, depth of lung absorption, and the temperature of combustion or vaporization.
The THC that enters the blood via the lungs travels directly to the brain, bypassing the liver. This means the THC your brain receives is delta-9-THC in its original form. Effects begin within 1 to 5 minutes, peak at 15 to 30 minutes, and typically subside within 2 to 3 hours.
The critical difference between smoking and vaping lies in byproducts. Combustion (smoking) produces tar, carbon monoxide, and hundreds of potentially harmful pyrolytic compounds. Vaporization heats cannabis below combustion temperature (typically 315°F to 440°F versus 1100°F+ for combustion), producing significantly fewer harmful byproducts. A 2015 study in PLOS ONE found that vaporizer users reported fewer respiratory symptoms than smokers despite similar cannabis consumption levels.
Oral Consumption: Edibles
Edibles follow a completely different pharmacological pathway. When you eat a cannabis edible, THC is absorbed through the gastrointestinal tract and passes through the liver before reaching systemic circulation. This process is called first-pass metabolism, and it changes the game entirely.
In the liver, the enzyme CYP2C9 converts a significant portion of delta-9-THC into 11-hydroxy-THC (11-OH-THC). This metabolite crosses the blood-brain barrier more efficiently than delta-9-THC and binds to CB1 receptors with greater affinity. In other words, the THC your brain sees from an edible is not the same molecule as the THC your brain sees from a joint — it is a more potent derivative.
This is why 10mg in an edible hits harder than 10mg inhaled. It is also why the experience feels qualitatively different: more body-heavy, more psychedelic at higher doses, and significantly longer-lasting. Onset takes 30 to 120 minutes depending on stomach contents, metabolism, and individual variation. Peak effects occur 2 to 4 hours after consumption. Total duration is typically 4 to 8 hours, with some users reporting residual effects for up to 12 hours.
Bioavailability for edibles is low — approximately 4% to 20% — but the potency of 11-hydroxy-THC compensates for the lower absorption rate.
Sublingual and Buccal: Tinctures and Strips
Sublingual administration (under the tongue) offers a middle path. THC absorbed through the mucous membranes under the tongue enters the bloodstream directly, partially bypassing first-pass liver metabolism. This means faster onset than edibles (15 to 45 minutes) with a mixture of delta-9-THC and 11-hydroxy-THC reaching the brain.
Bioavailability is estimated at 15% to 35%, and the experience tends to feel intermediate between inhalation and oral consumption. The key advantage is dose precision and the ability to titrate gradually.
Topical and Transdermal
Topical cannabis products (creams, balms, lotions) do not produce systemic effects because cannabinoids have poor skin penetration and do not reach the bloodstream in meaningful quantities. They act locally, interacting with CB1 and CB2 receptors in the skin and underlying tissue. Transdermal patches, by contrast, use penetration enhancers to deliver cannabinoids into systemic circulation at a controlled rate, producing effects similar to oral consumption but with more consistent dosing over extended periods.
The Dosing Problem
The fundamental challenge across all consumption methods is that the relationship between milligrams consumed and subjective effects is not uniform. Ten milligrams of THC through five different delivery methods produces five meaningfully different experiences — different onset, different peak intensity, different duration, and different qualitative character.
This is compounded by individual variation. CYP2C9 enzyme activity varies genetically between individuals. Some people are rapid metabolizers who convert THC to 11-hydroxy-THC very efficiently, making edibles disproportionately potent for them. Others are slow metabolizers for whom edibles may take two hours to produce effects and feel milder than expected.
Use the interactive delivery method comparison below to see exactly how the same THC dose plays out across each consumption method — onset curves, peak intensity, duration, and what’s happening in your body at each stage.