Cannabis Education
HHC, THC-P AND ALTERNATIVE CANNABINOIDS
Beyond THC and CBD, a growing number of alternative cannabinoids have entered the UK vape market. HHC, THC-P, HHCP, THC-O, delta-8, and others are being sold as legal or semi-legal alternatives to traditional delta-9 THC. Some of these compounds are genuinely novel. Others are marketing dressed up as innovation.
This guide explains what each compound actually is, how it compares to standard THC, what the UK legal position looks like, and whether these products are worth trying.
The Main Alternative Cannabinoids
HHC (Hexahydrocannabinol)
HHC is a hydrogenated form of THC. Chemically, it is THC with hydrogen atoms added to its molecular structure. This modification makes HHC more stable (resistant to heat and UV degradation) and gives it a slightly different pharmacological profile.
Effects: HHC produces psychoactive effects broadly similar to delta-9 THC but typically described as roughly 70-80% as potent. Users report a milder, more clear-headed high with less anxiety than equivalent doses of THC. Physical relaxation is present but less heavy.
Duration: Similar to THC. Onset in 2-5 minutes when vaped, effects lasting 2-4 hours.
Legal status in UK: Ambiguous. HHC is not explicitly scheduled under the Misuse of Drugs Act, but the Psychoactive Substances Act 2016 potentially covers it as a substance capable of producing psychoactive effects. Some UK retailers sell HHC products openly. Enforcement has been minimal but the legal position is not confirmed safe.
THC-P (Tetrahydrocannabiphorol)
THC-P is a naturally occurring cannabinoid discovered in 2019 by Italian researchers. It has a longer alkyl side chain than delta-9 THC (seven carbons instead of five), which gives it significantly higher binding affinity for CB1 receptors.
Effects: THC-P is estimated to be 30 times more potent than delta-9 THC at the receptor level. In practice, this does not mean it feels 30 times stronger (pharmacology does not scale linearly), but it is noticeably more intense than standard THC at equivalent concentrations. Users report powerful psychoactive effects with strong physical sedation.
Duration: Longer than standard THC. Effects may last 4-8 hours due to the stronger receptor binding.
Legal status in UK: Similar grey area to HHC. Not explicitly scheduled but potentially covered by the Psychoactive Substances Act.
Important note: Because of its extreme potency, THC-P products require very careful dosing. A dose that would be moderate for delta-9 THC may be overwhelming for THC-P. Products marketed as “THCP vapes” by retailers like CaliBudz typically contain blends of THC-P with other cannabinoids rather than pure THC-P.
HHCP (Hexahydrocannabiphorol)
HHCP is to HHC what THC-P is to THC. It is a hydrogenated version of THC-P, combining HHC’s stability with THC-P’s enhanced potency. Very new to the market and limited research is available.
Effects: Reported as stronger than HHC, potentially comparable to or exceeding delta-9 THC in intensity. Very limited user data exists.
Legal status in UK: Uncharted. Not specifically addressed in legislation or enforcement.
Delta-8 THC
Delta-8 is an isomer of delta-9 THC (the standard THC). The chemical structure is nearly identical, differing only in the position of a double bond. Delta-8 occurs naturally in cannabis but in very small quantities. Commercial delta-8 is typically synthesised from CBD through chemical conversion.
Effects: Roughly 50-70% as potent as delta-9 THC. Often described as a “lighter” or “smoother” high with less anxiety. Good for users who find delta-9 THC too intense.
Legal status in UK: The Misuse of Drugs Act schedules “tetrahydrocannabinol” broadly, which most legal interpretations consider to include delta-8 alongside delta-9. Delta-8 is likely illegal in the UK despite being legal in some US states.
THC-O (THC-O-Acetate)
THC-O is a synthetic acetylated form of THC. It does not occur naturally in cannabis plants. It is produced through chemical synthesis involving acetic anhydride (a dangerous industrial chemical).
Effects: Reported as 2-3 times more potent than delta-9 THC. Some users describe mildly psychedelic properties at higher doses. Effects have a delayed onset compared to standard THC.
Legal status in UK: Almost certainly illegal. As a synthetic cannabinoid, it likely falls under both the Misuse of Drugs Act and the Psychoactive Substances Act. The US DEA has also classified it as a Schedule I substance.
Safety concern: The synthesis process involves hazardous chemicals. Quality control for THC-O products is a significant concern. We do not stock THC-O products.
How Alt Cannabinoids Compare to Delta-9 THC
| Compound | Relative Potency | Legal Risk (UK) | Safety Data | Natural? |
|---|---|---|---|---|
| Delta-9 THC | Baseline (100%) | Controlled (Class B) | Extensive | Yes |
| THCa | Converts to THC | Grey area | Equivalent to THC | Yes |
| Delta-8 THC | 50-70% | Likely illegal | Moderate | Trace amounts |
| HHC | 70-80% | Grey area | Limited | Semi-synthetic |
| THC-P | Much stronger | Grey area | Very limited | Yes (trace) |
| HHCP | Stronger than HHC | Uncharted | Very limited | No |
| THC-O | 2-3x stronger | Likely illegal | Very limited | No (synthetic) |
| CBD | Not psychoactive | Legal | Extensive | Yes |
Should You Try Alternative Cannabinoids?
The pragmatic view: If you have access to quality delta-9 THC products, alternative cannabinoids offer limited advantages for most users. Delta-9 THC has the most research behind it, the most predictable effects, and the widest product selection. The alternative cannabinoid market exists largely because of legal loopholes rather than because these compounds offer a genuinely superior experience.
Where alternatives make sense: HHC may suit users who find delta-9 THC too anxiety-inducing but want more than CBD offers. Delta-8 serves a similar role. THC-P appeals to users with extremely high tolerance who need enhanced potency.
Where to be cautious: The safety data for most alternative cannabinoids is very limited. Long-term effects are unknown. Manufacturing quality varies significantly because these products exist in regulatory gaps. Synthetic compounds (THC-O) carry additional manufacturing safety risks.
Our range focuses primarily on delta-9 THC and THCa products, where product quality and effects are well-established. For THCa specifically, read our THCa Vapes Explained guide. For legal, non-psychoactive options, see our CBD products.
Frequently Asked Questions
Is HHC legal in the UK? The legal status is ambiguous. HHC is not explicitly scheduled under the Misuse of Drugs Act but may fall under the Psychoactive Substances Act 2016. Products are available from some UK retailers, but this does not confirm legality.
Is THC-P really 30 times stronger than THC? At the receptor binding level, yes. In terms of subjective user experience, the difference is significant but not proportional. THC-P is noticeably stronger than delta-9 THC but does not feel 30 times as intense. Careful dosing is essential.
Are alternative cannabinoids safe? Limited data exists for most alternatives. Delta-8 and HHC have more user experience behind them than newer compounds like HHCP or THC-O. Synthetic cannabinoids (THC-O) carry additional manufacturing concerns. When in doubt, well-tested delta-9 THC or CBD products have the strongest safety profiles.
Why do alternative cannabinoids exist? Primarily because of legal loopholes. In markets where delta-9 THC is restricted, manufacturers developed alternative compounds that produce similar effects while technically falling outside specific scheduling language. The UK’s Psychoactive Substances Act complicates this strategy.
Which alternative cannabinoid is closest to regular THC? HHC is most frequently described as “THC-like” with slightly reduced intensity and less anxiety. Delta-8 is similar but weaker. THC-P is significantly stronger. None are identical to delta-9 THC.
