There is no switch you can flip. THC does not get flushed out by anything you drink or do. Your body has to metabolize it, and how long that takes depends on the dose, the method, your tolerance, and how often you use. Smoked or vaped flower usually clears in a few hours. Edibles can run much longer, sometimes most of a day.

So the honest answer to "how do I sober up" is: wait it out, and spend the wait making yourself comfortable. What follows is what actually helps, what wastes your time, and the point where you should stop treating this at home.

How long is this going to last?

Rough guide, not a promise:

• Smoked or vaped flower: peak in 10 to 30 minutes, most effects gone in 2 to 4 hours.
• Vape pens and concentrates: similar to flower, though high-potency oil can hit harder and linger a bit past the 4-hour mark.
• Edibles and drinks: 30 minutes to 2 hours to kick in, and 4 to 8 hours of effect. Dose matters a lot here, and so does whether you ate beforehand.
• Heavy daily use: you may feel foggy well past the point where the high itself fades. That is not the same as being impaired, but it is real.

What helps you feel more normal

None of these lower the amount of THC in your blood. They make the ride smoother, which is most of what you can control.

• Water or a sports drink. Cottonmouth, dizziness, and headache all get worse when you are dry. Sip, do not chug.
• Eat something simple. A snack with protein or sugar can settle low blood sugar and nausea. Crackers, toast, fruit, yogurt. Greasy food usually backfires.
• Lie down or sit somewhere calm. Familiar room, low light, dim screens. A loud party is the worst place to be high and anxious.
• Sleep if you can. Sleep is the closest thing to a fast-forward button you have.
• Fresh air and slow breathing. Not because it metabolizes THC, but because it cools down the panic spiral, and panic is what makes a high feel endless.
• Skip more cannabis and skip alcohol. Adding depressants on top of THC is how a manageable high turns into a bad night.

If you think you are greening out

Greening out is the slang for a bad, physical cannabis reaction: nausea, cold sweat, pale skin, rapid heartbeat, dizziness, sometimes vomiting or a fainting feeling. It feels scary and it usually passes, but you should sit or lie down rather than try to walk it off.

• Sit or lie down with your head elevated. If you feel faint, lie on your side.
• Get cool air on your face and neck.
• Sip cold water and try a little sugar.
• Tell someone nearby how you feel, so you are not alone if it gets worse.

Some people swear by chewing black peppercorns or taking CBD to take the edge off. The evidence is thin and it is not a reversal agent. It is fine to try if it calms you down, but do not count on it.

What does not work

• Coffee and energy drinks. Stimulants stack on top of a racing heart and anxiety. Bad trade.
• Cold showers. You will be cold and still high.
• Drinking a gallon of water. That does not clear THC, and drinking too much water fast is its own problem. It also does not beat a drug test.
• Walking it off. Movement is fine if you feel steady. Ambling around while dizzy is how people fall.
• "Just having one drink." Alcohol plus THC is a recipe for the spins and, if you end up driving, real danger.

Do not drive, even if you feel mostly fine

Impairment outlasts the feeling of being high. Coordination, reaction time, and judgment come back later than the buzz does, which is why so many people get behind the wheel thinking they are good. If you are asking how to sober up, you are in no shape to drive. Call a ride, wait it out, or sleep on the couch.

When to get medical help

Most highs end without any care. Call 911 or a nurse line if you see:

• Chest pain, or a heartbeat that will not slow down after resting
• Vomiting that will not stop, or vomiting with severe abdominal pain (this can signal a rare condition called cannabinoid hyperemesis syndrome in long-term heavy users)
• Fainting, confusion, trouble staying awake, or trouble breathing
• Panic that keeps escalating and does not ease with rest and time
• Any thought of self-harm

If this happens often, or if you are using more than you intend, that is worth a conversation with a clinician. Nobody in the ER is there to lecture you. They see this a lot, and they would much rather you come in than wait it out alone.