Cannabis first time effects timeline
Inhaled cannabis effects start in seconds to 10 minutes, peak at 15 to 30 minutes, and fade over 2 to 4 hours. Edible effects start in 30 minutes to 2 hours, peak at 2 to 4 hours, and last 6 to 12 hours. THC is the compound that causes the high. CBD does not cause a high.
Inhaled timeline: smoke, vape, dab
- 0 to 10 minutes: first effects. Dry mouth, warmth, a shift in mood or hearing.
- 15 to 30 minutes: peak. Heart rate can rise 10 to 20 beats per minute. Time feels slower. Coordination and short-term memory drop.
- 1 to 2 hours: effects taper.
- 2 to 4 hours: most people return to baseline.
Edible timeline: gummies, drinks, baked goods
- 0 to 30 minutes: no effects. The THC is still moving through the stomach and liver.
- 30 minutes to 2 hours: onset. Feelings build.
- 2 to 4 hours: peak. Effects are stronger and last longer than inhaled THC. The liver converts THC into 11-hydroxy-THC, a compound with stronger effects.
- 4 to 8 hours: decline.
- 8 to 12 hours: most people return to baseline. A large dose can last longer.
First-time dose
Start low. For edibles, 1 mg to 2.5 mg THC is a common first dose. Wait 2 hours before a second dose. For inhaled cannabis, take 1 puff and wait 10 minutes. Check the label for THC per serving, not THC per package. Potency has climbed. In 1995, the average THC content of confiscated cannabis was about 4%. In 2021, it was around 15%. One puff from a modern product can carry more THC than older flower did.
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Effects that show up on a first try
- Dry mouth
- Red eyes
- Faster heart rate
- Slowed reaction time
- Short-term memory trouble
- Anxiety or paranoia, more common at high doses
- Nausea and dizziness, sometimes called greening out
- Sleepiness
What changes the timeline
- Method: inhaled THC reaches the brain in seconds. Eaten THC passes through the liver first.
- Dose: 10 mg hits harder than 2 mg.
- Potency: THC content in flower and concentrates varies by product and state.
- Food: a full stomach slows edible absorption and can delay the peak.
- Tolerance: a first-time user feels more than a daily user at the same dose.
- Body: weight, liver enzymes, and genetics change how fast THC clears.
- CBD: CBD does not cause intoxication. Studies on CBD and THC interaction show mixed results.
Drug tests and detection
THC metabolites stay in the body longer than the high. Urine tests detect THC for about 3 days after one use and up to 30 days with heavy long-term use. Blood tests detect THC for hours. Saliva tests detect it for 1 to 2 days.
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When to get help
Cannabis alone has not been linked to a fatal overdose, but high doses cause severe symptoms. Call 911 for chest pain, a fast heart rate that will not slow, fainting, severe vomiting, or thoughts of self-harm. Tell the dispatcher what was taken and when. Edibles send more people to emergency rooms than inhaled cannabis, and children are at higher risk from small doses.