The most common bad cannabis experience in Canada is an edible that "wasn't working" — so the person took another, and another, and the universe folded in on itself ninety minutes later. Almost every one of these is preventable with a calibration map.
The rule of two
The two numbers that matter for every form are onset and time to peak. Wait the peak time before dosing again. That's it. That's the rule.
| Form | Typical onset | Time to peak | Duration |
|---|---|---|---|
| Inhaled (flower, pre-roll) | 1–10 min | 15–30 min | 1–3 h |
| Vape (concentrate cart) | 1–5 min | 15–30 min | 1–4 h |
| Sublingual (tincture under tongue) | 15–45 min | 60–90 min | 4–8 h |
| Edibles (gummy, baked good) | 30–120 min | 2–3 h | 4–8 h |
| Drinks (THC beverage) | 15–30 min | 60–90 min | 4–6 h |
| Topical | N/A (no systemic high) | N/A | localised, hours |
These numbers shift on empty vs full stomach, body composition, tolerance, and the cannabinoid profile of the product. Take them as starting points, not lab values.
The dose-start rule
If you've never used the specific form before, start with half the lowest dose the package suggests and wait the full peak time. For edibles in Canada, that's 5 mg THC, which means start with 2.5 mg. For inhaled cannabis, that's one small inhalation, then wait fifteen minutes before the next.
The dose that ruined your friend was probably their fourth try at finding their floor. Yours will likely be lower.
Why edibles bite harder
When you swallow THC, your liver converts a portion of it to 11-hydroxy-THC, a metabolite that crosses the blood-brain barrier faster than THC itself. The high is longer and qualitatively different — stronger body load, longer cognitive tail. This is the same compound, by a different door.
This is also why people who feel fine inhaling 25 mg get sideways on a 10 mg gummy. The pathway, not the milligrams, is doing the work.
Mixing forms
Stacking is where calibration breaks down. A common trip up:
- Eat a 10 mg gummy at 7:30 pm.
- Get impatient at 8:15 pm, smoke a joint.
- Feel good at 8:45 pm.
- Edible peaks at 9:30 pm and the world tilts.
The fix: pick one form per session, or treat the inhaled bridge as a one-shot — not a refill — while you wait for the edible to land.
When you've overshot
You can't overdose on cannabis in the medical sense, but you can have a deeply unpleasant few hours. Drinks of water, a quiet room, no caffeine, no alcohol. CBD doesn't reliably "rescue" a THC high, despite the persistent rumour — what it does do is calm down anxiety adjacent to the high, which sometimes is what you actually need.
Most rough edible experiences resolve in 4–6 hours from peak. Sleep helps. Tomorrow exists.