Synthetic cannabinoids (also known as Synthetic marijuana, Noids, Herbal incense, K2, or Spice) are a class of compounds that bind to cannabinoid receptors to produce cannabis-like subjective effects. Most synthetic cannabinoids are analogs of Δ9-tetrahydrocannabinol (THC), the main active compound of cannabis, while non-psychoactive cannabinoids such as CBD are less well studied. Like THC, most synthetic cannabinoids bind to the same cannabinoid receptors in the brain and are often sold as legal alternatives.
Synthetic cannabinoids are usually sprayed or soaked into dry herbs to look more like marijuana, but pure powder is also available for sale as a gray area research chemical through the use of online vendors. They are commonly smoked or vaporized to achieve a quick onset of effects and rapid offset.
Unlike cannabis, the chronic abuse of synthetic cannabinoids has been associated with multiple deaths and more dangerous side effects and toxicity in general. Therefore, it is strongly discouraged to take this substance for extended periods of time or in excessive doses.
Popular herb blends include K2 and Spice, both of which are generic trademarks used for any synthetic cannabinoid product. Synthetic cannabinoids are often marketed as "herbal incense" and "herbal smoking blends." Pre-mixed, branded blends (like Spice and K2) are more dangerous than pure powder because the specific chemicals and dosages are usually unlisted as well as the potential of inconsistent areas of dense powder, leading to an overdose.
Many people have been hospitalized or suffered negative symptoms believing they are comparable to cannabis in potency, harm potential, and effects. This is not the case, and they should be avoided in favour of pure powder.
For a comprehensive list of known synthetic cannabinoid derivatives, /r/Drugs/wiki has published a respectable directory of names and links to further information.
Toxicity and harm potential
Unlike cannabis, there have been multiple deaths associated with the repeated abuse of synthetic cannabinoids as well as serious side effects resulting from its long-term use. Therefore, it is strongly discouraged to take this substance for extended periods of time or in excessive doses. Compared to cannabis and its active cannabinoid THC, the adverse effects are often much more severe and can include high blood pressure, increased heart rate, heart attacks, agitation, vomiting, hallucinations, psychosis, seizures, and convulsions as well as many others. Sixteen cases of acute kidney injury resulting from synthetic cannabinoid abuse have been reported. JWH-018 has also been associated with strokes in two healthy adults.
It should be noted that pre-mixed, branded blends (like Spice and K2) are more dangerous than pure powder because the specific chemicals and dosages are usually unlisted as well as the potential of inconsistent areas of dense powder, leading to an overdose. As synthetic cannabinoids are active in the milligram range (with below 5mg being a common dose), it is important to use proper precautions when dosing to avoid a negative experience.
These more severe adverse effects in contrast to use of marijuana are believed to stem from the fact that many of the synthetic cannabinoids are full agonists to the cannabinoid receptors, CB1R and CB2R, compared to THC which is only a partial agonist and thus not able to saturate and activate all of the receptor population no matter of dose and resulting concentration.
It is strongly recommended that one use harm reduction practices when using these drugs.
Unlike cannabis, there have been multiple deaths associated with the chronic abuse of synthetic cannabinoid use. Three deaths in Colorado have been investigated for being linked to synthetic cannabis. In addition, five deaths have been associated with the use of 5F-PB-22 in the United States and at least two deaths linked to MDMB-CHMICA. AB-FUBINACA has also been associated with multiple hospitalizations and deaths due to its use.
Like THC, prolonged usage of synthetic cannabinoids may increase one's disposition to mental illness and psychosis, particularly in vulnerable individuals with risk factors for psychotic illnesses (like a past or family history of schizophrenia). It is recommended that individuals with risk factors for psychotic disorders not use synthetic cannabinoids.
In contrast to most other recreational drugs, the dramatic psychotic state induced by the use of synthetic cannabinoids has been reported in multiple cases to persist for several weeks, and in one case for seven months after complete cessation of drug use. It has been suggested that the lack of an antipsychotic chemical (the cannabidiol found in natural cannabis) may make synthetic cannabis more likely to induce psychosis than natural cannabis. As with the acute adverse physical effects, this increase in the risk of psychotic side effects has also been connected to full rather than partial agonism.
Although there is no valid data on the toxicity of synthetic cannabinoids so far, there is concern that the naphthalene group found in THJ-018 and some other synthetic cannabinoids may be toxic or carcinogenic.
When compared to cannabis, the chronic use of synthetic cannabinoids can be considered more moderately addictive with a high potential for abuse and is capable of causing psychological dependence among certain users. When addiction has developed, cravings and withdrawal effects may occur if a person suddenly stops their usage.
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