Space cake effects: onset, duration and the risks to know
By the Golden High teamUpdated 12 October 202610 min read
Harm reduction
Space cake effects take much longer to arrive than a joint: expect between 30 minutes and 2 hours before you feel anything, and they can last up to 12 hours. That delay, not the cake itself, is behind most bad experiences. Here's how it works, why the "second slice" is the classic trap, what to do if things go wrong and what the law says. No recipe here.
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Space cake: cannabis you eat.
A space cake is a baked treat (cake, brownie, muffin) with cannabis mixed in, usually as an infused fat. The name has become generic: people also use it for cannabis cookies, sweets or chocolates, known in English as edibles. What they share isn't the recipe but the route in: the THC goes through the stomach and liver instead of the lungs.
When you smoke, you feel the effect building and you can stop. When you eat, nothing happens for a long time, then the effect lands all at once. The French public drug information service, Drogues Info Service, puts it like this: the effects of ingested cannabis are delayed, stronger and "impossible to adjust".
- Route in: digestive (stomach, gut, then liver).
- Onset: 30 minutes to 2 hours before the first effects, sometimes longer.
- Duration: 4 to 12 hours, with possible after-effects for up to 24 hours.
- Status in France: a cake containing THC is still a controlled drug, whatever form it takes.
This article gives no recipe, no preparation tips and no THC dosage. It's written for adults and only aims to help you understand the effects and reduce the risks.
How it works
Space cake effects: the detour through the liver.
When you inhale, THC goes from your lungs into your blood and on to your brain almost directly. When you eat it, it first has to be digested, absorbed by the gut and then pass through the liver before it reaches the rest of your body. This is called the first-pass effect. A key review of cannabis pharmacokinetics (Huestis, 2007) points out that much of the swallowed THC is transformed at this stage, and that oral bioavailability is only around 10 to 20 %.
But the liver doesn't just break THC down: it also converts it into 11-hydroxy-THC (11-OH-THC), a metabolite that is psychoactive in its own right. The same review notes that after oral intake, blood levels of 11-OH-THC are higher than those of THC, whereas the reverse is true when you smoke. Early researchers even thought it was the real active compound.
0 to 30 min
Usually nothing. This is when people wrongly assume the product is too weak.
30 min to 2 h
The first effects appear, at the pace of digestion. Drogues Info Service says 1 to 2 hours, versus 15 to 20 minutes when smoked.
Up to 4 h
According to Canada's Chief Medical Officers of Health, it can take up to 4 hours to feel the full effects.
4 to 12 h
The effects last 4 to 12 hours according to the same source. Drogues Info Service mentions an average of 4 to 6 hours.
Up to 24 h
After-effects (tiredness, foggy head) can linger into the next day.
These times vary with body weight, metabolism, a full or empty stomach and, above all, how much is actually in the slice: a "homemade" cake has no guaranteed content.
What the sources say
The numbers behind the nasty surprises.
Eaten cannabis isn't "gentler" than smoked cannabis: it's actually over-represented in emergency rooms. The most solid data points:
Annals of Internal Medicine · 2019
A study at a large university hospital in Colorado found that edibles accounted for 10.7 % of cannabis-related ER visits between 2014 and 2016, while making up just 0.32 % of THC sales in the state. These visits more often involved acute psychiatric symptoms (18 % vs 10.9 %), intoxication (48 % vs 28 %) and cardiovascular symptoms (8 % vs 3.1 %).
Canada's Chief Medical Officers of Health · 2020
Their official statement stresses that the delay between eating and feeling the effects "can lead to overconsumption" and raises the risk of intoxication. It also warns about accidental poisoning of children and pets, since these products can be mistaken for ordinary food.
Huestis · Chemistry & Biodiversity · 2007
The review describes oral bioavailability of 10 to 20 %, heavy liver metabolism into 11-OH-THC, and peak blood levels that can occur several hours after ingestion.
Drogues Info Service
The French public information service points out that the risk of a "bad trip" is higher with ingested cannabis, and that you can still feel rough in the days after using it.
In short: a long delay, a dose that's hard to judge, an effect you can't stop. That trio explains why edibles cause proportionally more accidents than joints. Full references at the bottom of the page.
Space cake danger
The "it's not doing anything" trap.
The story is always the same. You eat a slice, wait 45 minutes, nothing happens. You decide the cake is "weak" and have another slice. An hour later, both doses kick in at once. It's exactly the mechanism described by Canadian health authorities: waiting pushes people to overconsume.
- Having more within 2 hours. Feeling nothing after an hour means nothing: it can take up to 4 hours to feel the full effect.
- Mixing with alcohol. The two effects add up, and you feel unwell faster.
- Eating an "unknown" slice. With no label or lab test, nobody knows what's in a slice, not even the person who baked it.
- Using alone, somewhere unfamiliar. If the effect goes beyond what you expected, there's nobody to help you.
- Planning to drive "once it wears off". With effects lasting up to 12 hours, that moment comes much later than you think.
| Smoked cannabis | Eaten cannabis | |
|---|---|---|
| First effects | 15 to 20 minutes (DIS) | 30 minutes to 2 hours |
| Full effect | Fast | Up to 4 hours |
| Duration | Shorter | 4 to 12 hours, after-effects up to 24 h |
| Control | You can stop | Impossible to adjust once swallowed |
| Main molecule | THC | THC + 11-OH-THC (active metabolite) |
This delay applies to every potent molecule. We go into it in more depth in our article on controlled sessions and "overconfidence overdose", and in the one explaining how to read a product's intensity before you light it.
If things go wrong
What to do if you feel unwell?
A space cake "bad trip" is unpleasant and can be frightening: racing heart, anxiety, a feeling of losing your grip, nausea, dizziness. In the vast majority of cases these effects do wear off, but they can last several hours. Tiredness or anxiety can linger for a few days; if they don't ease, see a doctor.
Settle somewhere calm
A quiet, familiar place, soft lighting, little stimulation. Don't stay alone: have someone you trust with you.
Don't add anything
No alcohol, no other substance, no "slice to calm down". Sip water slowly.
Call if needed
In France, Drogues Info Service answers 7 days a week on 0 800 23 13 13 (free call). If in serious doubt, call 112 (the European emergency number), or 15 (SAMU) in France.
Call 112 immediately (or 15 in France) if the person shows any of these signs:
- loss of consciousness or can't be woken up;
- chest pain, palpitations that won't settle;
- seizures, severe confusion, repeated vomiting;
- a child or an animal has eaten some, even with no visible symptoms.
If the person is unconscious but breathing, put them in the recovery position while you wait for help.
Space cake Amsterdam
Amsterdam: tolerated there, not in France.
Plenty of people try their first space cake in the Netherlands. Cannabis is still prohibited by law there, but coffee shops operate under a tolerance policy: according to the Dutch government, they can sell to adults, up to 5 grams per person, with no advertising and no hard drugs.
In France, on the other hand, THC is a controlled drug: bringing a space cake back means transporting a controlled drug. And while you're there, the trap is the same: a whole slice eaten in one go, drinks on a terrace, the effect hitting you on the tram. If you travel, keep the three basic rules in mind: a small amount, at least two hours' wait before considering anything else, never alone and never before driving.
And in France?
In France, THC is still a controlled drug.
In France, THC (delta-9) is classed as a controlled drug. Only hemp products with a THC content of no more than 0.3 % are tolerated. A space cake made with regular cannabis falls outside that framework: possessing and using it is prohibited.
On driving, we've covered it in smoking CBD before driving: dangerous or not? and in our guide to the THC, HHC and CBD saliva test.
At Golden High, we only sell products under 0.3 % THC, lab-tested: our Delta-P flowers and our resins are smoked or vaporised, so you can go gradually. For a first time, a moderate strength like the Gelato Delta-P 10 % is the most sensible starting point. The full range is explained on our Delta-P page, and the idea of going in small doses in our article on cannabinoid microdosing.
Your questions
What people ask us about space cake.
How long does a space cake take to kick in?
Usually between 30 minutes and 2 hours, at the pace of digestion. The full effect may only be reached after 4 hours. That's why you should never have another slice because you "can't feel anything".
How long do space cake effects last?
4 to 12 hours according to Canadian health authorities, and 4 to 6 hours on average according to Drogues Info Service. After-effects such as tiredness can last up to 24 hours.
Why does a space cake hit harder than a joint?
Because the liver turns some of the swallowed THC into 11-OH-THC, a metabolite that is psychoactive in its own right. And because you can no longer adjust the dose once the cake is eaten.
Is space cake dangerous?
The main risk is overconsumption. In Colorado, edibles accounted for 10.7 % of cannabis-related ER visits while making up 0.32 % of sales.
What should you do after a bad trip on space cake?
Settle somewhere calm with someone you trust, don't take anything else, drink water. In France, Drogues Info Service answers on 0 800 23 13 13. Loss of consciousness, chest pain or seizures: call 112, or 15 in France.
Can you bring a space cake back from Amsterdam?
No. In the Netherlands, coffee shop sales are tolerated, but in France THC is a controlled drug: transporting or using a cannabis space cake is prohibited there.
Can you drive the day after a space cake?
The effects can last up to 12 hours, and in France the offence applies as soon as a test is positive. The only safe rule: don't drive after taking a psychoactive product.
Sources
The references cited in this article.
- Drogues Info Service. Eating space cake; Space cake effects that won't go away (in French).
- Public Health Agency of Canada (2020). Statement from the Council of Chief Medical Officers of Health on cannabis extracts, edible cannabis and cannabis topicals.
- Huestis M. A., Chemistry & Biodiversity (2007). Human Cannabinoid Pharmacokinetics.
- Monte A. A. et al., Annals of Internal Medicine (2019). Acute Illness Associated With Cannabis Use, by Route of Exposure: An Observational Study.
- Government of the Netherlands. Toleration policy regarding soft drugs and coffee shops.
- Légifrance. Article L3421-1 of the French Public Health Code (fixed fine amended by law no. 2026-798 of 18 August 2026); article L235-1 of the French Highway Code (penalties amended by law no. 2025-622 of 9 July 2025) (in French).
- French Court of Cassation, criminal chamber, 21 June 2023. Appeal no. 22-85.530 (in French).
