First image of the tested substance
First image of the tested substance
Second image of the tested substance
First image of the tested substance
Second image of the tested substance
Second image of the tested substance

Active ingredients and content

Hexahydrocannabinol (HHC)

Quantity not determinable

Details of the substance tested


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Fracture groove

Relevant substance(s)


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Risk assessment

This hashish sample declared as THC contains the semi-synthetic cannabinoid hexahydrocannabinol (HHC) instead of THC. Furthermore, no THC and no CBD was detected in the sample.

Hexahydrocannabinol (HHC) is offered in some countries as a legal alternative to ∆9-THC products ("classic" THC). HHC is a THC derivative that occurs only in trace amounts in the cannabis plant. It is therefore primarily from THC (for example, from cannabis extracts), but it can also be produced fully synthetically. Studies from the early 1940s indicate that HHC is about half as potent as ∆9-THC, but otherwise has similar effects.

According to user reports, the effect spectrum is similar to that of ∆9-THC, but in higher doses, the substance is said to have an effect that is perceived as unpleasant. Since many highly concentrated HHC products such as vapes and e-liquids are circulating on the market, the risk of overdose is high. In case of overdose, nausea, dizziness and vomiting may occur. Little is known about the risks and side effects of HHC (user reports), and there is no data at all on the long-term effects of consumption.

More information about HHC can be found in our blog post at

Alert level

Safer Use


With newly purchased, unfamiliar cannabis products, it is advisable to test only a small amount the first time (take two or three puffs) and then wait about 15 minutes for the effect to develop. If the effect is unusual, do not continue to use the product!

Mixed use

Avoid mixed use. Mixed use with other substances (including alcohol or medications) is very risky because of the unpredictable and still unknown interactions. Avoid mixed use with MAO inhibitors, opioids or tranquilizers.

Mix well

Mix your cannabis products well before consumption (ideally use a grinder) to avoid a high concentration of possible synthetic cannabinoids on individual flower parts. Particular care should be taken with residual material that has fallen off the outer parts of the flower, as this is often likely to contain a particularly high concentration of synthetic cannabinoids.

Similar warnings

There are no current warnings for this substance

Things to know