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How does cannabis get you high?

How do marijuana’s psychoactive properties work?

Have you ever looked at your hands? I mean really looked at your hands?

You might think you have, but as the above classic Doonesbury cartoon implies, people who are high on cannabis may perceive mundane objects to be far more fascinating than usual.

How is it that a plant that first emerged on what’s now the Tibetan Plateau can change humans’ perception of reality? The secret lies in a class of compounds called cannabinoids. While cannabis plants are known to produce at least 140 types of cannabinoids, there’s one that’s largely responsible for many of the effects of feeling high. It’s called tetrahydrocannabinol, or THC.

When a person smokes or inhales cannabis, THC “goes into your lungs and gets absorbed … into the blood,” according to Daniele Piomelli, a professor of anatomy & neurobiology, biological chemistry, and pharmacology at the University of California, Irvine School of Medicine. Edibles take slightly longer trip through the liver, where enzymes transform THC into a different compound that takes a bit longer to have an effect on people’s perception of reality.

THC that’s inhaled “reaches pretty high levels fairly quickly,” Piomelli told Live Science. Within 20 minutes, the circulatory system is carrying molecules of THC to every tissue in the body, including the brain, where it can alter neural chemistry.

“From the lungs, it’s a pretty straight shot to the brain,” according to Kelly Drew, a professor of chemistry and biochemistry at the University of Alaska Fairbanks.

The THC molecules that pass the blood-brain barrier will find that they fit snugly into receptors that ordinarily receive compounds called endocannabinoids, which the body produces itself. These receptors are part of the endocannabinoid system, which is involved in several functions, including stress, food intake, metabolism and pain, according to Piomelli, who also directs the Center for the Study of Cannabis at UC Irvine.

“The endocannabinoid system is the most pervasive, diffused and important modulatory system in the brain because it controls the release of pretty much every neurotransmitter,” Piomelli said. Neurotransmitters are molecules that brain cells, or neurons, use to communicate with each other. One neuron sends a message to the next by releasing neurotransmitters, such as dopamine or serotonin, into an infinitesimal gap that separates one neuron from the next. The gap is called the synapse.

The neuron on the receiving end of the synapse is called the postsynaptic neuron, and it “decides whether to fire based on the input it receives,” Drew told Live Science. These neural signals cascade through intricate circuits of neural connections that function on a tremendous scale; there are about 85 billion neurons in the brain and as many as 100 trillion connections among them.

The presynaptic neuron sends neurotransmitters across the synapse to the postsynaptic neuron, Piomelli said. But the presynaptic neuron can also receive information. When a postsynaptic neuron has fired, it can send a message across the synapse that says, “the neuron I come from has been activated,” stop sending neurotransmitters, Piomelli said. It sends this “stop” message in the form of endocannabinoids that bind to a receptor called cannabinoid 1 (CB1).

“Like a sledgehammer”

When THC enters the brain, the molecules diffuse into the synapses where they “activate CB1 receptors,” Drew said. THC doesn’t cause the most extreme possible response like some synthetic cannabinoids such as K2 or spice, but it does “turn up the volume” and increase the likelihood that the presynaptic neuron it affects will temporarily stop sending neurotransmitters, she said.

“The high is a very simple phenomenon, Piomelli said. “THC comes in like a sledgehammer,” flooding the endocannabinoid system with signals the postsynaptic neurons didn’t send. When presynaptic neurons across the brain get the memo to stop sending neurotransmitters, this alters the normal flow of information among neurons and results in a high.

Scientists have yet to decipher exactly what happens during this euphoria, however.

That’s because, in part, U.S. legal restrictions make it difficult to study cannabis. But from what researchers have gathered so far, THC appears to temporarily “unplug” the default mode network. This is the brain network that allows us to daydream and think about the past and future. When our brains are focused on a specific task, we quiet this network to let our executive function take control.

There’s evidence that THC has a significant effect on the network, but researchers aren’t quite sure how it happens. There are cannabinoid receptors all over the brain, including in “areas that constitute the key nodes of the [default mode network],” Piomelli said. It could be “that THC deactivates the [default mode network] by combining with those receptors,” but it’s also possible that THC quiets the network through an “indirect effect that involves cannabinoid receptors in other brain regions.”

Scientists are still working to find the mechanisms that result in a person feeling high, but there’s some reason to think this effect on the default mode network is a significant piece of the puzzle.

Unplugging the default mode network “takes us into a mental place where the function of the things we experience is less important than the things themselves: our hands are no longer just something we use for touching or grabbing, but something with inner existence and intrinsic value,” Piomelli said. Psychedelics, such as LSD or dried psilocybin-containing mushrooms, do the same thing.

However, people can experience highs differently. “The feeling of becoming fascinated by and ‘connected’ with ordinary things, things we see and use every day, is not universal but does happen, especially when high doses of THC-containing cannabis are used,” Piomelli said.

THC doesn’t just affect the default mode network. It may also, in the short-term, flood the brain with dopamine, the brain’s reward signal, according to a 2017 study in the journal Nature. (Long-term, it may blunt dopamine’s effects, the study found.) That, in part, may explain some of the euphoria associated with a high, and places cannabis in the company of other drugs that people use to feel pleasure.

“Every drug that has rewarding properties affects that system,” Drew said.

Aftereffects

The effects of a high from cannabis that’s smoked or inhaled typically last for a few hours, though it can take edibles almost that long to start affecting users. And while cannabis isn’t the dangerous substance it was made out to be in the 20th century, using it comes with some risk. For one, while cannabis is legal for recreational and medical use in some states, it’s still illegal in many parts of the country.

It’s also important to bear in mind that cannabis is a potent pharmacological substance. Cannabis can cross the placenta, so pregnant people should avoid it. And “heavy use in the teenage years can be problematic,” Piomelli said. For instance, cannabis — and especially synthetic cannabinoids like spice — can exacerbate psychosis. “People who are at risk for that should not smoke it,” Drew said.

Finally, cannabis does affect the ability to drive, particularly in occasional users. Drew cautioned that people should not drive for three hours after smoking.

Eventually, the THC will leave the brain; the profusion of blood that brought THC into the brain will carry it to the liver, where it will be destroyed and expelled in urine.

And you’re not gonna believe this, but your hands — they were the same the whole time.

Originally published on Live Science.

IMHO, drugs which do not easily cause overdose deaths (like THC, LSD etc) should/must be legally treated same as alcohol (which is really just another kind of drug (which do not easily cause overdose deaths))!

IMHO, just like prohibition of alcohol had caused so much crime in the past (& that is why it had been forced to be repealed later), prohibition of other similar drugs causing so much easily preventable crime today!
We need to take lesson from our past.

It gives people relief without vice.

This is precisely why it has been vilified for so long. You cannot have such things. Fun, pleasure and relief without vice?

That is blasphemy of the highest order for the “divinely” inspired. In their distorted concept of “dealing with life”, you have to tough it out. Anything which circumvents such rigors in life is sinful.

It reminds one of the famous counter-culture response: “Reality is for people who cannot deal with drugs.”

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Here’s how cannabis jumbles up typical brain processing.

Beyond Chronic

Medical Marijuana Information You Can Trust

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Old Hippie’s Levels of Consciousness Scale

On /r/trees, there’s a “highness scale” that people use to indicate how high they are. I love all the Ents at /r/trees, and Im’a let you finish, but that scale is not quite the most useful scale of all time, because it’s relative. I realize none of this is completely scientific, and that everything is relative, and all that kind of stuff, but “10 is the highest you’ve ever been in your life” doesn’t quite cut it for me, because I’ve seen a lot of ups and downs and everyone else will too. So I prefer to use a scale with known points on it, as far as is possible.

For levels 0 through 10, you should use this chart, which is as good as anything else I’ve found. It was originally created by Talisman, whoever s/he is, and I’ve actually searched to give better credit. I typed it in from this image, which I consider to be the actual source (or a copy, anyway) and much more artistic than my mere words.

0 Sober: completely normal, you feel nothing out of the ordinary.

1-2 Buzzed: you can tell you are slightly high, things are more interesting, everything seems “thicker”.

3-4 High: you are high, slight craving for food, you tend to stare at objects and into space often, you feel relaxed but somewhat in a daze.

5-6 Really High: you are fully high, there is a slight vibration in your body, focusing is hard, you’re having very random thoughts. Putting together sentences is a challenge. Few if any audial hallucinations.

7-8 Blazed/Stoned: very high, vibrations and waves of euphoria rush through your body every 5 to 9 seconds. Expeiencing mild CEVs, everything dark has a sparkling texture, everything is brighter. Some audial hallucinations.

9-10 In Space: completely lost in thought, amazing pleasure, you feel like a god, you see strong CEVs, sparkling textures everywhere, everything is brightened, mild/strong audial hallucinations.

My scale merges with and attempts to extend Talisman’s scale even further into the cosmic realm. I do not attempt to catalog the exact physical/mental effects, the way Talisman did, because it’s not necessary or even possible from this point on. If you’ve reached these levels, you will understand, and if you haven’t…you will understand when you do reach them. It’s based on a lot of experience (almost 45 years), not to mention the unexpected trip I took yesterday, in which all the following information was dumped into my brain like Buckaroo Banzai in the phone booth.

10. This is the top level high you should expect from smoking marijuana. If you can move at all, it is not very fast. If you’re not standing up…don’t even try.

11. You have found the “secret level”! You didn’t think you could get this high by smoking marijuana, and you’re right, because…you cannot generally get here without edibles. You are totally on the verge of tripping, but aren’t. It is intense as fuck but still light and happy. This is the same level as an “acid high”, which you experience on an LSD trip both on the way up and on the way down.

12. You are now tripping. Congratulations and try to hold it together.

13. You are tripping and losing control. If you don’t manage to keep control at this level (or above), you may well lose your mind temporarily or even permanently, and/or find yourself in an emergency room or mental institution. If you are on LSD (or similar), this is the part usually called “peaking”.

14. You have made it past the danger zone, mostly. But you can re-enter it at any time, literally with a single thought. You can also become totally enlightened with a single thought. This level and the next three are otherwise indescribable, and they (and your experiences) differ mainly based on the dosage you have taken…each level is essentially a doubling of the previous dosage.

15. This is the farthest/highest I have ever been, and it took 1,000 micrograms of LSD to get me there. Once is plenty, thank you!

18. You have now merged your consciousness with the universe. You no longer need the Internet to share thoughts with others. You are also stone cold dead, completely alive, a bumblebee, a flower, a cat, Buddha, Jesus Christ, an alien, and God…simultaneously.

None of these levels actually require drugs, but a lot depends on your actual body, blood, and brain chemistry (some people were just not born to be the Buddha…and some were).

Most experiences have a general “cruising altitude” with some parts at a somewhat higher level (generally one or two levels higher). Most people cite the “cruising altitude” but it’s the highest level on their experience that they will remember, because it’s the part that scared them the most, generally 🙂

Why 11 for the secret level? Do you really have to ask?

Why 13 for bad trips? I guess it goes with all the other 13-phobia 🙂

Why 18 for the top of the scale? Probably from all the meanings of 18.

If you’re into psychedelic philosophy, 12 and 13 are theoretically the same level…as is 14. Just remember that once you’re actually tripping, it’s like running on a spinning soccer ball glowing from the inside…any disturbance or loss of control will likely cause you grief, and you don’t want to find out how bad it can be.

Very few people make it to Level 18. If you are reasonably well educated, at least in terms of world cultures, then you already know most of their names…

Beyond Chronic Medical Marijuana Information You Can Trust Click here to subscribe or unsubscribe to posts (free). Old Hippie’s Levels of Consciousness Scale On /r/trees, there’s a