Delta-9 THC: everything you need to know about the main molecule in cannabis

Delta -9 THC is one of the best-known natural compounds in cannabis. As the main component responsible for the psychoactive effects associated with marijuana, it is widely studied, has a rich history, and is central to European legislation governing the plant.

 

Want to learn more about this unique cannabinoid? Let's explore its definition, role, effects, history, and legal status to learn everything about Delta-9 THC.

What is Delta-9 THC?

Delta -9 tetrahydrocannabinol (Delta-9 THC) is a phytocannabinoid : it is the main natural cannabinoid in cannabis. It is found in all parts of the plant, but in the highest concentration in the flowers. THC concentration can vary depending on the plant's genetics and cultivation methods. It often has a concentration between 5 and 10%, but can exceed 20% in modern varieties. It is also present in hemp at much lower levels, on the checkout of 0.2 to 0.3% depending on the country.

 

The psychotropic effects of Delta-9 THC are due to its interaction with the body's endocannabinoid system (ECS). The ECS is a network of receptors found throughout the body and brain. This interaction modulates the response of certain biochemical processes, producing the effects we will see.

How does it affect the SEC?

Delta -9 THC acts primarily on the CB1 and CB2 receptors of the endocannabinoid system, with which it exhibits a particularly strong affinity. This biological system, and these receptors in particular, are involved in regulating the overall homeostasis of the body and nervous system.

 

CB1 receptors are primarily found in the brain, while CB2 receptors are mainly located in the immune system. Together, they contribute to overall stabilization and balance by regulating several processes. By binding to these receptors, Delta 9 THC alters the release of several neurotransmitters (dopamine, glutamate, GABA, etc.), which notably influences:

 

• Mood
• The pain
• Appetite
• Memory
• Sensory perception
• The immune response

What are the effects of Delta-9 THC?

The effects of THC are numerous and fairly well studied. By interacting with endocannabinoid receptors present in the brain and central nervous system, it creates:

 

• A feeling of euphoria
• Alterations in the perception of color, time, and space
• A feeling of relaxation and euphoria

However, these effects can vary depending on several factors: the dose, the method of consumption, individual tolerance, personal sensitivity, mood…

Side effects

Being psychoactive, Delta 9 THC can also cause certain side effects at varying doses depending on individual tolerance. These side effects include:

 

• Dry mouth
• Red eyes
• Drowsiness
• Difficulty concentrating
• Immediate memory problems
• Feelings of anxiety or unease

It is because of these adverse effects that Delta-9 THC and the cannabis that contains it are illegal in mostcountries of the world. Some studies also suggest that Delta-9 THC may have negative effects on brain development in children and adolescents.

The history of Delta-9 THC

While cannabis enjoyed relative popularity in the 19th century, following Napoleon's conquest of Egypt, Delta-9 THC, the molecule producing the effects appreciated by hashish users, wasonly discovered in the 1940s. Indeed, it was at this time that the American chemist Roger Adams managed to partially isolate the cannabinoid; however, he was not yet able to determine its exact structure or describe its role.

 

 

It wasn't until 1964 that the Delta-9 THC molecule was definitively isolated and correctly identified.
This discovery is attributed to Professor Raphael Mechoulam, a world-renowned researcher and undoubtedly one of the scientists who contributed most to the scientific understanding of the plant. He published the complete chemical structure of Delta-9 THC and demonstrated that it is the main psychoactive component of cannabis.

 

While cannabis had been illegal in most Western countries since the first half of the 20th century, THC was classified as a controlled substance worldwide less than ten years after its discovery. In 1971, at the UN Convention on Psychotropic Substances, THC was classified as a Schedule I psychotropic substance, the most restrictive category: it was considered dangerous and without medical application.

The legality of Delta-9 THC in France and Europe

Fortunately, since the 1970s, legislation concerning THC has been slightly relaxed. Nevertheless, it remains strictly regulated in most member states of the European Union.

 

While 21 of the 27 European Union countries will have authorized medical cannabis for research purposes by 2025, under varying degrees of strictness, only three countries (Malta, Luxembourg, and Germany) currently allow recreational cannabis use. Although other countries like the Netherlands, Spain, and Portugal have adopted more permissive policies, THC remains strictly regulated in the majority of European countries.

 

In France, after being completely banned, Delta-9 THC has been permitted at a maximum level of 0.3% since 2018. The limit of 0.2% or 0.3% is shared by most European Union countries. It legally distinguishes between hemp, which complies with the THC concentration limit, and cannabis, which is a criminal offense.

Possession and consumption of Delta-9 THC: what are the risks?

Possession and consumption of cannabis with a Delta-9 THC level exceeding the legal threshold set by the laws of various European Union countries can lead to prosecution and legal proceedings in most European countries. However, each country has its own laws on this matter : penalties and prosecutions can depend on several factors, such as the quantity possessed.

 

In France, for example, you risk up to one year in prison and a fine of 3,750 euros. A fixed fine of 200 euros is provided for possession of less than 100 grams.

 

Source: European Monitoring Centre for Drugs and Drug Addiction (2025)

 

For more information about European penalties, we recommend this article dedicated to cannabis legislation in Europe.

The case of Delta-9 THC gummies and edibles

For the past few years, gummies containing Delta-9 THC have been available in CBD shops, both physical and online . If you're wondering how they can be found when THC is prohibited, the answer is relatively simple: they comply with current regulations. In fact, they contain only 0.3% Delta-9 THC.

 

But to ensure you experience the effects of the molecule, the manufacturers have resorted to a little trick by increasing the weight of each candy as much as possible. Thus, a candy weighing 10 grams contains 30 mg of THC, the equivalent of the THC found in 0.3 g of cannabis with 20% THC.

CBD: a legal alternative to THC

Aside from THC gummies and edibles, many people in France are looking for an alternative to Delta-9 THC : an alternative that is legal and less harmful to health. It is with this in mind that we offer a wide range of CBD products.

 

 
Discover our CBD flowers and resins
 

 

CBD does not alter perception or state of consciousness. However, through its interaction with the endocannabinoid system, it can contribute to a feeling of relaxation, general calmness, or muscle relaxation, depending on the user.

 

To meet these expectations, we offer a selection of potent CBD flowers and resins that comply with current regulations. These products respect the legal THC limits (less than 0.3%) and allow you to enjoy the effects of hemp without psychoactivity, in full compliance with French law.