Cannabis Consumption Methods: How Inhaled, Oral and Other Products Differ
Short answer: How cannabis enters the body changes how fast effects start and how long they last. Inhaled THC acts within minutes. Swallowed THC can take up to an hour and a half to start and lasts much longer. The figures below come from peer-reviewed pharmacology reviews, not from marketing claims. This guide is educational and doesn't recommend any method or product.
Inhaled vs. oral THC: the research numbers
| Inhaled (smoked or vaporized) | Oral (edibles, capsules, swallowed tinctures) | |
|---|---|---|
| Effects begin | Seconds to a few minutes | 30–90 minutes |
| Peak | 15–30 minutes | 2–3 hours |
| Duration | Tapers within 2–3 hours | About 4–12 hours, depending on dose |
| Bioavailability reported | 2–56% (smoked) | 4–20% |
Sources: onset, peak and duration from Grotenhermen 2003, Clin Pharmacokinet. Bioavailability from Huestis 2007, Chem Biodivers.
The wide bioavailability range for smoking reflects differences in how people inhale: the number of puffs, how long they hold, and volume (Huestis 2007). After oral use, the liver turns more THC into 11-OH-THC, a metabolite that is also psychoactive, than after inhalation (Grotenhermen 2003).
Methods at a glance
- Smoking flower: burns the plant. Inhaled timing applies.
- Dry-herb vaporizer: heats flower without burning it. Inhaled timing applies.
- Vape cartridge: heats a concentrated oil. Buy only licensed, lab-tested products. CDC linked the 2019 EVALI lung-injury outbreak mainly to THC vaping products from informal sources, with vitamin E acetate strongly implicated (CDC).
- Edibles and capsules: oral timing applies. Because onset is delayed, taking more before the first dose takes effect can lead to taking more than intended.
- Tinctures: liquid extracts. If swallowed, oral timing applies. We haven't found a peer-reviewed figure we're confident in for under-the-tongue timing, so it's listed as UNKNOWN.
- Topicals: applied to the skin.
- Concentrates: high-potency extracts. Potency is on the label.
In DC
Licensed products come from ABCA-licensed retailers and carry lab results (how to read a COA). Start with our start-low dosing guide. DC law limits where you can consume (where you can smoke in DC).
To buy, register first: start your ABCA registration. Then browse the licensed dispensary directory.
Frequently asked questions
How long do edibles take to kick in?
Effects typically begin 30–90 minutes after eating, peak at 2–3 hours, and last about 4–12 hours, depending on dose (Grotenhermen 2003).
How fast does smoking or vaping work?
Effects begin within seconds to a few minutes, peak at 15–30 minutes, and taper within 2–3 hours (Grotenhermen 2003).
Why do edibles feel different from smoking?
After oral use, the liver converts more THC into 11-OH-THC, a metabolite that's also psychoactive (Grotenhermen 2003). Oral bioavailability is reported at 4–20% (Huestis 2007).
How fast do tinctures work under the tongue?
UNKNOWN. We haven't found a peer-reviewed figure we're confident in. If swallowed, oral timing applies.
Where can I consume cannabis in DC?
DC law limits where you can consume. See where you can smoke in DC and licensed Safe-Use lounges.
Keep reading
Sources
- Grotenhermen F. Pharmacokinetics and pharmacodynamics of cannabinoids. Clin Pharmacokinet. 2003;42(4):327–360. https://pubmed.ncbi.nlm.nih.gov/12648025/
- Huestis MA. Human cannabinoid pharmacokinetics. Chem Biodivers. 2007;4(8):1770–1804. https://pmc.ncbi.nlm.nih.gov/articles/PMC2689518/
- CDC, EVALI outbreak: https://archive.cdc.gov/www_cdc_gov/tobacco/basic_information/e-cigarettes/severe-lung-disease.html
Educational information only, not medical advice. Talk to a healthcare provider about your situation. 21+.