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How long does K2 last?

How long K2 effects last depend on individual factors such as how much you smoke, your weight, your height, and overall health. Researchers do know that the effects from JWH-018 (a specific ingredient which used the be found inK2 products) usually lasts for 1-2 hours, and the effects of CP 47, and 497-C8 (also synthetic cannabinoids) lasts can last for 5-6 hours.  But so much less is known about many of the ingredients found in K2.  More on the duration of K2 effects here, with a section at the end for your questions about the addictiveness of K2 or the dangers of smoking K2.

What is in K2?

K2 is a combination of plant based material sprayed with synthetic cannabinoids that can trigger extremely potent THC-like effects. There are many variations on this drug. While packages are labeled “not for human consumption” or “aromatherapy only”, many people smoke K2 to provoke hallucinatory effects.

Synthetic cannabinoids can be classified into eight general groups, based on the type of chemical alteration made to the original substance. These include:

  • benzoylindoles
  • cyclohexylphenols
  • naphthoylindoles
  • naphthoylpyrroles
  • naphthylideneindenes
  • naphthylmethylindenes/naphthylmethylindoles
  • phenylacetylindoles
  • tetrahydrocannabinols

K2 effects on the body and brain

K2 users claim that experiences on synthetics are similar to those produced by marijuana, relaxation, elevated mood. However, in many cases, how long K2 stays in your body increases in length and the effects of K2 on the brain are stronger than those of marijuana. Some users report psychological effects such hallucinations, panic attacks, paranoia, and agitation. Some physical symptoms can manifest as dangerously elevated heart rates and blood pressure, increased respiration rates, dilated pupils numbness, very pale skin, and/or vomiting. While little is known about the long term effects of K2 on the body or brain, its acute effects can trigger symptoms that are both frightening and dangerous.

K2 duration of action

K2 is usually smoked via a joint or water pipe, which allows quick absorption of synthetic cannabinoids to the bloodstream. Changes in perception and mood start to occur within minutes after inhalation and can last for hours after use. Because of the complex chemical composition of K2, it is likely that some varieties also contain substances that could cause dramatically different effects of the body.

Symptoms such as tachycardia, increased appetite, or xerostomia (dry mouth) can last up to 6 hours after consumption. Some uncomfortable symptoms like nausea and vomiting can also persist for this amount of time. Severe symptoms of K2 intoxication such as hallucinations, vomiting, or high blood pressure / heart rate should be addressed immediately by medical professionals.

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K2 time in the body

Active substances in synthetic cannabis are metabolized in the liver, and ejected in the urine. While K2 may not be detected on a routine urine drug test, the presence of JWH-018 can be detected up to 2 months on a substance-specific test following a single low dose. In the case of chronic use, the detection window for K2 may be longer.

How long does a K2 high last?

Because of the complexity of this drug, it is hard to precisely estimate the duration of the high effect. According to some studies, the duration of a K2 high can last from 1-8 hours, but users claim that the effects last longer. Research studies have shown that and intense high lasts between 10-30 minutes.

K2 high effects

A K2 high effect is similar to that caused by marijuana – relaxation, elevated mood, and altered perception. The difference between them is that the effect of this synthetic drug is stronger. Additionally, because K2 is a combination of new synthetic cannabinoids recently put on the market, experts are not familiar with how it affects the brain. Because we don’t know all the ways K2 may affect a user’s health, or how toxic it may be, use of K2 is highly discouraged.

Questions about K2

Do you have additional questions about K2? Please leave us your questions in the comments section below. We’ll do our best to respond to you personally and promptly…or to refer you to experts who can help.

Reference Sources: National Institute on Drug Abuse: Monitoring the Future. National Results on Adolescent Drug Use
National Institute on Drug Abuse: Drug Facts: Spice (“Synthetic Marijuana”)
Drug Facts: What Is Spice

Photo credit: szabodorina

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24 Responses to “How long does K2 last?
Patrick
4:35 pm November 10th, 2014

I had smoked K2 about 2 months ago and had stopped.Currently i am having severe heart palpitations/anxiety attacks and have had a loss of appetite.Are effects of spice reversible?Who should i reach out to in my condition?

9:41 am November 11th, 2014

Hi Patrick. The truth is, scientists still don’t know all the ways Spice may affect human health or how toxic it may be, but one public health concern is that there may be harmful heavy metal residues in Spice mixtures. Another problem is that mixtures of synthetic marijuana vary greatly.

Without further analyses, it is difficult to determine whether you have someting to be concerned about. I’d suggest seing a doctor and getting some tests done in order to determine what’s wrong.

Jeffrey
7:38 pm November 17th, 2014

I am very addicted to spice. I have tried to stop several times. Now my whole life depends on quitting. I feel awful. I have been researching side affects of quitting and I have a lot of them. I have not seen diarrhea on any of these sites but I have had it really bad. Is this part of the withdrawals?

MJ
3:32 pm February 19th, 2015

Hi. I’ve been smoking k2(specifically the different flavors of smacked) for a little over a year now and have now started to see some symptoms. As I write this my hands and feet are sweating profusely while I lay in bed with the fan on practically high. I would consider myself a healthy person, but i dont find these effects normal. Previous to this k2 habit, I was a 5year weed smoker. Unfortunately I can say I am addicted (not to k2 but to smoking in general) as the longest I’ve went without it was 2 days so its hard for me to judge what’s normal k effects and what might be my own bodily complications. After smoking sometimes I feel a bit restless and anxious, then the feeling of having to pee rushes over me but only momentarily and then is followed by the sweaty hands feet and groin. This has only been happening consistantly for the past few months. I first experienced this while a couple months pregnant. Had a bad day and decided to smoke a blunt. Afterwards I couldnt sleep for like 2 days and eventually went to the hospital because I couldn’t stop throwing up( because I was pregnant) had no appetite and was severely dehydrated but kept sweating. I have a history of low blood pressure and an iron deficiency so that could’ve just been the perfect storm so to speak. Has anyone else had complications such as these?
If symptoms persist I’ll definitely be switching back to weed or nothing at all.

Denise
8:29 pm July 1st, 2015

I believe my daughter may of been effected by k2. She is now in a mental hospital with paranoia, delusions, and hallucinations. They are looking into sending her to a long term facility because she just isn’t snapping out of it. Have you heard of anyone else having these symptoms prolonged like this?

4:46 pm July 3rd, 2015

Hi Denise. Because synthetic marijuana is never the same in chemical composition, and it’s a relatively new drug, not many clinical studies or reports on the long-term psychological symptoms have been done. However, many past users have experienced mental issues upon quitting synthetic marijuana, and the symptoms you describe can resemble those of others.

Kailey
12:53 pm August 1st, 2015

my friend smoked this before and she did it maybe three times but the first time she did nothing happened then the second and she blacked out she didnt even know who i was. she stupidly did it again and she tripped out everything she said was numb and now she feels like when she looks at things she said she can feel the high coming back. shes young and she has school coming up what do i do to help ?

FAUVET
12:20 pm August 10th, 2015

I smoked k2 only one time sine know what really what the effect of it. Today, I suppose that I have DPD disorder. I live in France, so psychiatre don’t really know what is this stuff…Do you thing that TMS can cure me ? Or I can consider that I sill suffer all my Life? Thanks to your help

jayne
3:36 am September 9th, 2015

hello my son started smoking this crap to replace pot cause of a union job. he says he stopped smoking it 3 days ago. but, i still feel unsettled. he is not having withdrawals thats why i can’t understand. but i check his eyes and speech and no dilate normal pupils and speech is clearer. can u tell me otherwise.

adam
6:05 am November 11th, 2015

Can you die from k2 withdraws and its been 5 days since the last time we smoke an we still feel numb lack of sleep

8:45 pm November 11th, 2015

Hello Adam. The length of time K2 withdrawal symptoms last depend upon the dosage, and duration of abusing the drug, as well as person’s predisposition to psychoses and addiction. Generally speaking, symptoms occur in the first hours after a missed dose and can last for days or weeks. But, if your situation gets worse, then seek help from a doctor.

Gina
1:35 pm December 8th, 2015

we believe my son was given K2 instead of marijuana by a “friend”. He smoked it with this person 11 days ago and is having a very rough time with paranoia, anxiety and some delusions. We are scared to death for him and are trying to find out how long he may be feeling like this.

4:55 pm December 9th, 2015

Hi Gina. It depends on the blend of synthetic marijuana and the amount he smoked. In any case, he will be feeling better as he continues not to smoke and his organism heals, but don’t hesitate to seek medical treatment for the effects he is experiencing. I cannot tell how long the effects will persist, though.

cass
4:24 pm January 23rd, 2016

I smoked k2 for the first time about 4 or 5 days ago. Not knowing it was k2, I smoked a lot of it. I had a seizure from the panic attacks. I went to the hospital the a night after and they put me on an IV. The hallucinations have stopped but 5 days later and im having extreme headaches and my whole body feels numb. I have no idea why. I don’t know if its going to go away or not and I am very scared that I might feel like this forever.

Muhammad
4:38 pm March 24th, 2016

Please i am so scared, i smoked k2 yeasterday and i still kinda feeling it tho i am not high. Please tell me is going to last forever or just temporary?.
Thanks

Zuri
11:23 pm March 27th, 2016

Hi, my name is Zuri my brother was in college and some students gave him k2 instead of marijuana. He was having hallucinations of my dead aunt but he’s gotten better. But he’s now starting to have sweaty palms and he gets nervous easily. How long does the sweaty palms last for and the nervousness?

Lydia @ Addiction Blog
2:54 pm March 29th, 2016

Hi Zuri. The duration of Spice withdrawal symptoms depend upon how long a person has been abusing the drug, how heavily they were using it and also their predisposition to addiction and psychoses. Generally, symptoms occur in the first hours after a missed dose and can last for days or weeks.

MJ
3:49 pm March 29th, 2016

So it’s been a year since I quit the k2. I’m feeling much better. I do admit to smokjing weed occasionally now but weed is nothing in comparison. I’m healthy and in control of my life. I write this for those that ask “will this high last forever?” Or “will I really be able to quit?” Yes you can and you don’t need rehab to do it, just self control. It’s unfortunate that in a year no one responded to my lenghty original post, but I still get notified if someone adds something to this thread. I wish all those that are still affected by k2 the best in life.

Becky
7:50 pm April 19th, 2016

My son has been experiencing these side effects for 6 days now how long will he be this way

Lydia @ Addiction Blog
3:50 pm April 21st, 2016

Hi Becky. I suggest you take your son to the ER.

John
12:59 am April 23rd, 2016

Brother quit six mths ago.still having side affects from k-2.

John
1:03 am April 23rd, 2016

Pyscosis.paranoia.see’s shawodow people talks to self .does not answer self thnk God.

Blyss
6:29 am August 2nd, 2016

i snoke k2 for about 2-3 weeks. I already and have depression and anixety and am nocompliant in taking meds. My last hit was abot 8-10 days ago. I am sitll having slight t major panic attacks. cant eat or sleep with out the valume the doc gave me. Slowly thats not working anymore. Every one around says that this should have subsided. But it has not. I will be fine and then an attack. I dont have the craving to use again. which is a good thing. Has any study shown permenant damage.

Laurie
12:27 am September 16th, 2016

Hey there. My boyfriend and smoked k2 on monday and for me it felt like weed. He is still feeling effects of the drug and its been 42 hours. He has slight motor paraylis and can barely get out of bed. He says his brain is “cloudy” or feels like “pressure” but he gets better as the days pass. Idk he is a different person since. I am freaked out. Please help!

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