Answer first

Inhaled THC reaches the brain in seconds. Symptoms start 1 to 10 minutes after a puff. They peak at 15 to 30 minutes and fade over 1 to 3 hours. Common symptoms include dry mouth, red eyes, a faster pulse, hunger, sleepiness, and a relaxed mood. High doses add anxiety, paranoia, nausea, vomiting, dizziness, and confusion. Chest pain, fainting, trouble breathing, or a pulse above 150 beats per minute at rest need emergency care.

Detox After THC Vape: A Comprehensive Guide

Onset and duration after a vape puff

Vaping heats cannabis oil or flower into an aerosol. THC moves from the lungs into the blood in seconds. Effects appear faster than edibles, which take 30 to 120 minutes to work.

more on this topic

  • First effects: 1 to 10 minutes
  • Peak: 15 to 30 minutes
  • Main effects: 1 to 3 hours
  • High dose effects: 4 to 6 hours

Common symptoms in the first hour

  • Dry mouth and thirst
  • Red, glassy eyes
  • Pulse up 20 to 50 beats per minute above your resting rate
  • Dizziness when standing, caused by blood pressure changes
  • Cough, throat scratch, chest tightness
  • Relaxed mood, sleepiness, laughter
  • Hunger
  • Slower reaction time and worse coordination
  • Short term memory trouble

THC widens blood vessels in the eyes and drops blood pressure, which explains the redness and the lightheaded feeling on standing. Heart rate climbs within minutes and returns to baseline in about 2 hours.

cannabis vape aftermath headache

Symptoms when the dose is high

Vape cartridges hold 60% to 90% THC by weight in many products. Dried flower holds 15% to 30%. A 3 second puff from a 70% cartridge can deliver several milligrams of THC. Puff length, temperature setting, and tolerance change the amount. Above a person's limit, symptoms shift:

symptoms after vaping cannabis

  • Racing thoughts, anxiety, panic
  • Paranoia or suspicion
  • Nausea and vomiting
  • Headache
  • Chills, sweating, pale skin
  • Tremor or muscle twitch
  • Confusion and hallucinations at very high doses

Green out

A green out is a short period of strong symptoms after too much THC. Signs include vomiting, dizziness, sweating, pale skin, fast pulse, panic, and weakness. Most cases pass in 1 to 4 hours. Rest, water, and a quiet room help. Mixing alcohol or other drugs with cannabis makes it worse.

Red flags that need emergency care

  • Chest pain or pressure
  • Pulse above 150 beats per minute at rest, or an irregular heartbeat
  • Fainting or no response to voice
  • Trouble breathing, blue lips
  • Vomiting that will not stop, or signs of dehydration
  • Confusion, hallucinations, or thoughts of self harm
  • Seizure
  • Fever above 101 F with cough and shortness of breath after vape use

Lung injury linked to unregulated vape carts

The CDC tracked an outbreak of EVALI, e-cigarette or vaping product use associated lung injury. As of Feb 18, 2020, states reported 2,807 hospitalized cases and 68 deaths. Vitamin E acetate was found in most lung fluid samples tested. That substance appears in some THC cartridges sold outside legal channels. Symptoms include cough, shortness of breath, chest pain, fever, chills, weight loss, and stomach problems. Licensed stores post lab results for the products they sell. Black market carts do not.

Cannabinoid hyperemesis syndrome

CHS appears in long term, frequent users. The pattern is morning nausea, cycles of vomiting, stomach pain, and relief from hot showers or baths. Symptoms stop after cannabis use stops. A clinician makes the diagnosis. High potency concentrates raise the THC dose, and dose is one factor in CHS reports.

What to do when symptoms feel strong

  1. Stop vaping.
  2. Sit or lie down. Keep the head above the feet if you feel faint.
  3. Drink water in small sips.
  4. Eat a light snack if you feel sick.
  5. Skip alcohol, caffeine, and other drugs.
  6. Stay with another person.
  7. Call Poison Help at 1-800-222-1222 for advice. Call 911 for chest pain, fainting, seizures, or trouble breathing.

How long THC stays detectable

Blood THC peaks within 10 minutes of a puff and drops over hours. Urine tests detect THC-COOH, a metabolite. Detection windows run about 3 days after one use, 5 to 7 days after occasional use, and up to 30 days after daily long term use. Body fat, hydration, and frequency change the number.

Factors that change your symptoms

  • Dose and product potency
  • Tolerance and use history
  • Body weight
  • Time since your last meal
  • Device temperature and cartridge additives
  • Mental health history
  • Alcohol or other drugs in the same session

Lower risk use

Start with one small puff. Wait 15 minutes before a second. Buy from licensed stores that post lab results. Keep carts away from heat. Do not share carts. Talk to a clinician if you take medicine for heart, lung, or mental health conditions.