Dosing
Edible Dosing Guide: How Many mg of THC to Start With
A dispensary sells you a 100mg package. The label calls 10mg a serving. Neither number is your dose. A first edible should land between 2.5mg and 5mg of THC, and the difference between a good night and a bad one is usually the second dose taken 45 minutes too early. This is the milligram math, by delivery method, plus what to do if you overshoot.
The short version
- 2.5mg is a microdose, 5mg is a real beginner edible dose, and 10mg is the standard retail serving that is already too much for a first timer.
- Edibles arrive 30 minutes to 3 hours after you swallow them and run 6 to 8 hours. Inhaled cannabis arrives inside 10 minutes and runs 2 to 4 hours.
- Wait a full 2 hours before taking any more. Redosing early is the most common way first timers end up too high.
- The same milligrams hit harder as an edible because the liver converts swallowed THC into 11-hydroxy-THC, a more potent compound that crosses into the brain easily.
- Tolerance is the largest variable and it builds inside 1 to 2 weeks of daily use. It also resets, so a 2.5mg starting dose is temporary.
- Too much THC is not known to be fatal on its own, but the peak sits at hours 2 to 4, and 1-800-222-1222 is free and staffed 24 hours a day if it turns frightening.
How many mg of THC to start with
The honest starting number for a first edible is 2.5mg to 5mg of THC. 10mg is what the industry calls one serving, and it is a serving for somebody who already consumes several times a week.
Most bad first experiences are not caused by an exotic product. They are caused by a normal 10mg gummy taken by a person whose body has never processed THC before.
| Dose | Who it fits | What it does |
|---|---|---|
| 2.5mg | Never had an edible, or wants to stay clearly functional | Light mood lift, some body ease, usually still sharp enough to hold a conversation |
| 5mg | A real first dose for most adults | Clearly psychoactive, warm, slowed down, still steerable |
| 10mg | The standard retail serving, sized for regular consumers | Strong for anyone without tolerance, with 6 to 8 hours attached to it |
| 20mg and up | Daily consumers and medical patients with built tolerance | Heavy sedation and real impairment for everyone else |
5mg is not a token dose. It is enough for most people with no tolerance to feel a clear change in mood, body and time perception for several hours. If somebody tells you 5mg does nothing, they are describing their own tolerance, not the dose.
Start low and go slow is only useful with numbers on it. Here it means: 2.5mg on the first night, 5mg on a later night if 2.5mg was underwhelming, and no jump to 10mg until 5mg feels comfortable and predictable.
Dose, onset and duration by delivery method
A milligram figure means nothing until you say how it enters the body. The same 5mg behaves like 3 different drugs depending on route.
| Method | Beginner dose | Onset | Duration |
|---|---|---|---|
| Inhaled flower or vape | 1–2 inhalations, roughly 1–5mg delivered | 1–10 minutes | 2–4 hours |
| Edible (gummy, chocolate, capsule) | 2.5–5mg | 30 minutes–3 hours | 6–8 hours |
| Sublingual tincture or strip | 2.5mg held under the tongue | 15–45 minutes | 4–6 hours |
Inhaling is the only method with a fast feedback loop. You feel one inhalation before you decide on the next, so the dose corrects itself, which is why some people find flower an easier first experience than an edible.
Edibles are the opposite. The dose is fixed the moment you swallow, the arrival window is wide, and the effect outlasts the evening. Sublingual products sit between the two, absorbing partly through the tissue under the tongue, which is why they arrive sooner and fade sooner than a swallowed gummy.
At the counter
Ask for the lowest milligram per piece in the case, not the lowest price per package. The question that gets you there: "What is the lowest milligram per piece you carry, and is it scored?"
A 100mg bag of 10 gummies is fine if you are willing to cut a gummy into quarters at home. A single 100mg chocolate bar with no scored squares is not, because you cannot divide it accurately.
Why edibles hit harder than the same milligrams smoked
Swallowed THC goes to the stomach, then to the liver, before any of it reaches the brain. That first pass through the liver converts a large share of it into 11-hydroxy-THC, a different compound that is more potent than THC itself and crosses the blood-brain barrier readily.
Inhaled THC skips that. It crosses from the lungs into the bloodstream and reaches the brain largely unconverted, which is why the effect is quicker, sharper at the front and shorter.
Oral absorption is actually less efficient than inhalation. A smaller fraction of what you swallow ever makes it into circulation. The experience is still stronger because what arrives is a more potent metabolite, and because it arrives slowly enough to keep arriving for hours.
The practical consequence: 5mg eaten is not comparable to 5mg inhaled. Treat the two ladders as separate and do not carry a dose across from one to the other.
Numbers
Oral bioavailability 4% to 20% of what you swallow reaches the bloodstream Inhaled bioavailability 10% to 35%, in a single pass 11-hydroxy-THC potency commonly put at 2 to 3 times THC itself in the brain Peak blood level, edible 1 to 3 hours after swallowing Peak blood level, inhaled 3 to 10 minutes after the last inhalation Share of a swallowed dose converted on the first liver pass most of it
Wait 2 hours before taking any more
Wait at least 2 hours after an edible before you take any more of it. This is the single rule that prevents most first-timer accidents.
The reason people break it is reasonable and wrong. At 45 minutes nothing has happened, the conclusion is that the dose was too small, and a second piece goes down. The first dose then arrives at minute 70, the second at minute 115, and both peak together on top of each other.
The CDC puts edible onset at 30 minutes to 2 hours, and a heavy meal or a slow digestive system can push the tail of that window past 3 hours. Nothing at 60 minutes is normal, not evidence of a weak dose.
Numbers: the first 2 hours, by the clock
0:00 5mg gummy, taken with a small snack 0:20 Nothing yet. This is expected. 0:45 Nothing, or a faint body warmth. Still expected. 1:10 First clear signal for most people 2:00 Earliest honest point to judge the dose 2:30 to 3:00 Peak 6:00 to 8:00 Back to baseline Next morning Mild grogginess for some people
If 2 hours pass and you genuinely feel nothing, the correct move is to write the night off and try 5mg or 7.5mg on another day, not to top up at hour 2 and stay up until 4am.
What changes the right dose for you
There is no single correct milligram number, because several variables move it at once. Tolerance moves it most.
| Variable | What it does | What to do about it |
|---|---|---|
| Tolerance | The largest factor by a wide margin. A daily consumer can need 5 to 10 times a beginner's dose for the same effect | Dose for your own recent use, not for the person recommending the product |
| Food in the stomach | Fat increases how much THC is absorbed. An empty stomach speeds onset and can sharpen the peak | Take it with a small snack rather than on an empty stomach or after a heavy meal |
| Other cannabinoids | Products with meaningful CBD or CBN alongside THC feel different at the same THC number | Read the full panel, not just the THC line |
| Medications | Cannabis shares liver enzymes with many drugs, and interaction with blood thinners such as warfarin is documented | Ask a pharmacist before combining, especially with anything requiring stable blood levels |
| Body chemistry | Enzyme activity varies between people, which is why 2 adults on identical doses report different nights | Treat your first dose as a measurement, not a verdict on the product |
| Label accuracy | Testing rules allow the real potency to sit inside a tolerance band around the printed figure | Treat the number as close rather than exact, which is another argument for starting low |
Body weight is the variable most people expect to matter and it matters least. There is no reliable dose-per-pound rule for THC the way there is for some medications, and a heavier person with no tolerance will not reliably handle 10mg better than a lighter one. Tolerance predicts the night. Weight barely does.
Reading a dispensary label and getting to tonight's dose
Nobody walks out of a shop holding 2.5mg. They hold a package. The label panel is what turns a package into a dose, and it carries 4 figures worth finding.
Total THC per package is the big number on the front and the least useful one. Per-serving THC, servings per package, and the test date are the ones that matter. A panel reading 100mg THC, 10 servings, 10mg per serving is the standard format.
Colorado defines a single serving of retail edible marijuana as 10mg of THC. That convention is why the gummies in a Denver dispensary case are almost always sold 10 pieces to a 100mg package, and it is the format you divide down from.
Worked example: one package, one first dose
Package: gummies, 100mg THC total Panel: 10 pieces, 10mg THC per piece Price: about $18 before tax
First ever dose: cut one gummy into quarters with a clean knife. One quarter is 2.5mg. Second session, a week later: cut a gummy in half. That is 5mg. The remaining 9.5 pieces go back into the child-resistant bag, into a cupboard, out of reach.
One $18 package is 40 first doses. Nobody needs to buy a second one to find their number.
Flower and vape carts work the same way with different arithmetic. When a Detroit dispensary menu lists 24% THC on a 3.5g jar, the jar holds roughly 840mg of THC, but combustion destroys much of it and most of the rest never reaches you, so a single inhalation delivers something in the low single-digit milligrams.
A 0.5g cart at 80% THC holds about 400mg. A short 2-second draw pulls a few milligrams. This is why inhaled dosing is counted in inhalations rather than milligrams, and why nobody can hand you an exact figure for one hit.
What to do if you took too much
Assume you have overshot, it is minute 90, and it is getting worse. Here is what actually happens next and what helps.
The peak sits between hours 2 and 4. It usually includes a racing heart, time running slowly, self-conscious thinking that loops, sometimes nausea, sometimes a strong urge to lie down. Most of it is gone by hour 6 to 8. Some grogginess can last into the next day.
What helps: a quiet dim room, a sober person nearby who knows what you took, sitting or lying down, slow breathing on a count, water, plain food, a cold cloth on the back of the neck. If sleep comes, take it. That is most of the list.
What does not help: more cannabis, alcohol, caffeine, or driving anywhere. Alcohol makes it worse. Black peppercorns and CBD get repeated constantly as antidotes and there is no reliable evidence behind either, so do not build your plan around them.
Numbers: an overshoot, hour by hour
Hour 1:30 Symptoms climbing. This is where people panic. Hour 2 to 4 The peak: racing heart, time distortion, nausea Hour 6 to 8 Most of it has passed Hour 12 to 24 Residual grogginess for some people Fatalities from THC alone None reported Poison Help, free and 24/7 1-800-222-1222
Cannabis overconsumption is not known to be fatal on its own. The National Institute on Drug Abuse states there are no reports of adults dying from cannabis alone. It does still send people to emergency rooms in real numbers, because a racing heart and a panic reaction feel exactly like an emergency while they are happening.
Call 1-800-222-1222, the free Poison Help line, if a child has eaten a product, if somebody consumed without knowing, if THC was mixed with alcohol or other drugs, or if you simply want a trained person on the phone. Call 911 instead for chest pain, trouble breathing, fainting or unresponsiveness, a seizure, or vomiting that will not stop.
How fast tolerance builds, and how fast it resets
THC tolerance builds fast. Daily consumption can noticeably blunt the effect inside 1 to 2 weeks, because the cannabinoid receptors the drug acts on reduce in availability under constant exposure.
It reverses on the same kind of timescale. A break of a few weeks brings receptor availability back up, and the dose that stopped working starts working again. People who take a month off routinely report that 5mg lands like it did the first time.
This is why the beginner ladder is explicitly temporary. If you consume regularly for a few months, 2.5mg will stop being a dose worth taking and 10mg will start feeling like the serving the label always claimed it was. And if you then stop for a month, you are back at the bottom of the ladder, which is where anyone returning after a long gap should restart regardless of what they used to take.
Worked example
One person, one product, 5 months. Northline raspberry gummies, 10mg per piece, 10 pieces in a $20 bag.
March, first edible ever 2.5mg, a quarter piece. Clear effect for about 5 hours. April, twice a week 5mg is the comfortable dose. A full 10mg piece is still too much. June, 4 nights a week 10mg lands roughly where 5mg used to. July, near daily 20mg is an ordinary evening. 10mg barely registers. August, 30 days off 5mg again, and it feels the way March did.
The dose climbed 8 times over 4 months and gave all of it back in 1.
FAQ
Is 10mg of THC too much for a beginner?
For most first timers, yes. 10mg is the standard retail serving, sized for people who already consume regularly, and taken by someone with no tolerance it usually produces 6 to 8 hours of strong impairment rather than a mild first experience. 2.5mg to 5mg is the range to start in.
Is 5mg of THC enough to feel anything?
Yes, for anyone without a built tolerance. 5mg reliably produces a clear change in mood, body sensation and time perception lasting several hours. The people who report feeling nothing at 5mg are almost always regular consumers describing their tolerance.
How long does a THC edible last?
6 to 8 hours for most people, with the peak between hours 2 and 4. Larger doses stretch the tail rather than only raising the peak, and some people notice mild grogginess the following morning. Plan the whole evening around it, not the next 2 hours.
Does body weight affect how much THC you need?
Barely, and far less than people expect. There is no reliable dose-per-pound rule for THC, and a heavier person with no tolerance should still start at 2.5mg to 5mg. Recent consumption history predicts your response much better than body weight does.
How much THC is in one joint or one hit?
A 0.5g joint of 20% flower contains about 100mg of THC, but most of that is destroyed by combustion or lost to the air, so the delivered dose is a fraction of it. A single inhalation typically delivers something in the low single-digit milligrams, which is why inhaled cannabis is counted in inhalations rather than in exact milligrams.
Should a beginner start with an edible or with flower?
Flower or a vape is the more forgiving first experience, because effects arrive within minutes and you can stop after 1 or 2 inhalations. Edibles are easier to dose precisely on paper and harder to correct in practice, since the dose is locked in the moment you swallow it.
Can a beginner build a THC tolerance quickly?
Yes. Daily use noticeably blunts the effect within 1 to 2 weeks, which is why a dose that worked in week 1 often feels weak by week 3. Tolerance also resets, and a few weeks off returns most people close to where they started.