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Synthetic and semi-synthetic cannabinoids

Synthetic cannabinoids are artificial chemicals that act on the cannabinoid receptors in the brain. Semi-synthetic cannabinoids are chemicals derived from the cannabis plant but altered so that they end up being chemicals that do not occur naturally. There are dozens of these chemicals, some have similar effects to cannabis, some are very different, and some of them can be very harmful.

Vapes purchased from illegal sources have been found to contain synthetic and semi-synthetic cannabinoids. These have contributed to many overdoses in the UK, some resulting in people being taken to hospital.

Some drugs are increasingly cut with dangerous synthetic opioids like nitazenes, which have killed 100s of people in the UK in the past year. This is happening in a wide range of drugs, not just heroin, and you can never really know what is in any street or counterfeit drug. Find out more about the risks and what to do here.

There is a wide list of products and brand names that is constantly changing. These are not necessarily associated with a particular drug or used consistently.

Also called:

  • HHC
  • K2
  • Mamba
  • Spice
  • Synthetic cannabis
  • Synthetic marijuana
  • THC vape (since these products may contain synthetic and semi-synthetic cannabinoids instead)

Quick info

How the drug works varies from person to person

How you might feel

Happy, relaxed, talkative and/or anxious, paranoid, sedated.

Read more about how it feels

Effects on your body

Effects can be similar to cannabis but can also be stronger or more unpleasant.

Read more about effects on your body

How long it takes to work

Usually smoked or vaped so pretty immediate. Slower if swallowed.

Read more about how long it takes to work

How long the effects last

Varies from about 1 to 6 hours depending on the specific chemical.

Read more about how long the effects last

Common risks

Easy to want more and take larger doses. Mental health can get worse. Psychotic episodes can be triggered, usually in those already susceptible, and last for weeks.

Read more about the risks

Mixing drugs

Mixing drugs is always risky but some mixtures are more dangerous than others.

Read more about mixing with other drugs

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