The history of THC

THC, or tetrahydrocannabinol, is the primary psychoactive compound in the cannabis plant. With a history spanning thousands of years, cannabis has been used by humans for both medicinal and recreational purposes. Records of its cultivation and use date back to ancient civilisations, including those in China, Egypt and Greece.

In the 19th century, scholars and physicians introduced cannabis into Western medicine, contributing to its rising popularity. In 1964, researchers in Israel identified the structure of THC, a discovery that opened the door to greater insights into the endocannabinoid system.

Key takeaways

• THC, or tetrahydrocannabinol, is the main psychoactive compound in the cannabis plant.
• Cannabis has a long history of both medicinal and recreational use.
• Cannabis was introduced into Western medicine in the 19th century.
• The structure of THC was determined in Israel in 1964, leading to advancements in research on its effects.
• The legal status of THC and cannabis has evolved over time, with some countries decriminalising or legalising it for various uses.
• I do not recommend using THC for recreational purposes.

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Discovery of THC

The history of THC stretches back thousands of years, with its origins in the early discovery and cultivation of cannabis in Central Asia.

Evidence shows that cannabis, the plant from which THC comes, was present in Central Asia around 12,000 years ago, when its seeds began to accompany the migration of nomadic peoples. Its use more than 5,000 years ago in what is now Romania has also been described, and its cultivation gradually spread to different regions. Ancient civilisations such as those in China, Egypt and Greece recognised its value and integrated cannabis into their traditional practices.

In the 19th century, cannabis was introduced into Western medicine by scholars and physicians, and its medical use grew in popularity. A major breakthrough came in 1964, when researchers in Israel identified the structure of THC, marking a significant step forward in understanding its role within the human body.

Today, cannabis continues to be a subject of research and discussion in both medical and recreational contexts. Studies into its effects and applications are ongoing, while the legal status of THC and cannabis varies worldwide, with some countries choosing to decriminalise or legalise their use.

Evolution of cannabis cultivation and medicinal use

Over the centuries, cannabis cultivation and its medicinal use have spread from Central Asia to ancient China, Egypt and Greece. The cannabis plant, known scientifically as Cannabis sativa, has been valued for its versatile properties and has played a significant role in various cultures throughout history.

In ancient China, cannabis was cultivated for its fibres, which were used to make textiles and ropes. The medicinal properties of cannabis were also recognised, and it was used in traditional Chinese medicine for various purposes, including pain and inflammation.

“The Chinese Emperor Fu Hsi (ca. 2900 BC), whom the Chinese credit with bringing civilization to China, seems to have made reference to Ma, the Chinese word for Cannabis, noting that Cannabis was very popular medicine that possessed both yin and yang.” - Robert Deitch, Hemp: American History Revisited: The Plant with a Divided History, 2003.

Ancient Egyptians used cannabis for medicinal purposes. Some modern writers have also linked the plant to religious practice and to the goddess Seshat, although this interpretation is not established. Cannabis was used in topical preparations: the Ebers papyrus, written in about 1500 BC, mentions its application for inflammation.

Cannabis pollen has been reported on the mummy of Ramesses II, who died in about 1213 BC. Historical references to cannabis in Ancient Egypt include uses related to the eyes, inflammation and other traditional applications.

In India, the medical and religious use of cannabis probably began around 1000 BC. Bhang, a traditional preparation made from cannabis leaves and often mixed with milk as a drink, is one of its forms, and cannabis came to be used in India for a wide variety of traditional purposes.

In ancient Greece, records of cannabis date back to the 5th century BC, when the historian Herodotus described its use by the Scythians. The Greek physician Dioscorides, writing in the 1st century AD, documented its uses in his influential work De Materia Medica, noting that applications made with the boiled root could lessen inflammation. Cannabis was also recognised for its psychoactive qualities: Herodotus described the Scythians being “delighted” by the smoke of burning hemp seeds, and the physician Galen wrote that small cakes containing cannabis were customarily served as a dessert in Italy.

The medical use of cannabis later spread from India to the Middle East and Africa. Ancient Persians distinguished between the plant’s initial euphoric effects and its later dysphoric effects, and well-known physicians in the Arab world, such as Avicenna, mentioned cannabis in their medical compendiums.

Jesus allegedly uses anointing oil made with cannabis

Chris Bennett argued in an article in High Times Magazine in February 2003 that Jesus used a cannabis-based anointing oil. The first part of the passage below is attributed to Bennett’s article. The second part comes from an article by Carl Ruck, a professor of classics at Boston University, published in The Sunday Times in January 2003, which discussed Bennett’s claims. These are contested interpretations rather than established historical facts:

“In the Bible’s New Testament, Jesus... anointed [his disciples] with [a] potent entheogenic [psychoactive substance] oil, sending out the 12 apostles to do the same [around the year 30 AD]...

Likewise, after Jesus' passing, James suggests that anyone of the Christian community who was sick should call to the elders to anoint him with oil in the name of Jesus.”

“So, did Jesus use cannabis? I think so. The word Christ does mean 'the anointed one' and Bennett contends that Christ was anointed with chrism, a cannabis-based oil, that caused his spiritual visions. The ancient recipe for this oil, recorded in Exodus, included over 9lb of flowering cannabis tops (known as kaneh-bosem in Hebrew), extracted into a hin (about 11 pints) of olive oil, with a variety of other herbs and spices. The mixture was used in anointing and fumigations that, significantly, allowed the priests and prophets to see and speak with Yahweh.

Residues of cannabis, moreover, have been detected in vessels from Judea and Egypt in a context indicating its medicinal, as well as visionary, use. Jesus is described by the apostle Mark as casting out demons and healing by the use of this holy chrism. Earlier, from the time of Moses until the later prophet Samuel, holy anointing oil was used by the shamanic Levite priesthood to receive the 'revelations of the Lord'. The chosen ones were drenched in this potent cannabis oil.”

The cultivation and medicinal use of cannabis continued to evolve over time, with different cultures adopting their own practices and beliefs surrounding the plant. The spread of cannabis cultivation and its medicinal applications laid the foundation for its use in modern medicine and the ongoing research into its potential benefits.

Table: traditional uses of cannabis in different cultures

Cannabis has a long history in many ancient cultures, where it was used for medicinal and, in some cases, spiritual purposes. Its cultivation and use spread across continents, shaping the practices and beliefs of different civilisations.

As our understanding of cannabis continues to grow, so does our knowledge of its potential medicinal uses. From ancient civilisations to modern research, cannabis remains a fascinating plant with a long and storied history.

The history of medicinal cannabis in Europe

When Napoleon invaded Egypt in 1798, his forces included a scientific expedition team. Alongside the discovery of the Rosetta Stone, the team brought cannabis back to France, where it was studied in Europe for its pain-relieving and sedative properties and gradually gained wider acceptance in Western medicine.

In the 19th century, scholars and physicians introduced medicinal cannabis more broadly across Europe, marking a turning point in the history of THC, the psychoactive compound in the cannabis plant. Interest in its potential applications grew, and its use became a subject of increasing study.

During this period, European physicians explored the reported properties of cannabis, whose main psychoactive compound, THC, had not yet been identified, and began prescribing cannabis-based preparations in medical practice. Their use in conditions such as rheumatism, muscle spasms and convulsions drew particular attention.

The introduction of medicinal cannabis to Europe also encouraged scientific investigation into how cannabis works within the body. This research eventually led to the identification of THC in 1964 and later to the discovery of the endocannabinoid system, a network of receptors that interacts with THC and other cannabinoids. This breakthrough paved the way for deeper exploration into cannabis and its applications.

Advancements in medical cannabis research

As understanding of THC advanced, research expanded to examine its potential applications. Studies investigated its use in areas such as managing chronic pain, addressing nausea, supporting appetite in patients undergoing chemotherapy and exploring whether it has a role in epilepsy, although the cannabis-based epilepsy medicine Epidyolex contains CBD rather than THC.

Research has also looked at different methods of applying THC, including inhalation and topical use. This work has supported the development of a range of THC-based formulations, including oils, capsules and creams, designed for use in line with relevant regulations and product classifications.

The medical uses of THC continue to be studied, with ongoing research exploring its potential in areas such as mental health, neurodegenerative diseases and cancer treatment. As societal attitudes towards cannabis evolve and more countries recognise medical cannabis, the future of THC research may support a better understanding of patient care and well-being.

Structure of THC and advancements in research

The structure of THC was identified in Israel in 1964, marking a breakthrough that advanced the understanding of cannabinoids and the endocannabinoid system. Since then, this psychoactive compound from the cannabis plant has been the focus of extensive research into its potential effects and applications.

Scientists have discovered that THC interacts with the body's endocannabinoid system, a network of receptors and molecules involved in regulating physiological processes. This interaction influences the release of neurotransmitters and can affect mood, appetite, pain perception and immune function.

Ongoing studies have also examined how THC may be applied in different contexts. Research has explored its role in areas such as managing chronic pain, addressing nausea and vomiting linked to chemotherapy and supporting appetite in patients with wasting syndrome.

More recently, researchers have investigated the potential of THC in neurological conditions including epilepsy and multiple sclerosis. Some early findings have pointed to possible neuroprotective properties, but these have not been established in people, and further research is needed.

As research into THC advances, scientists continue to uncover new insights into its mechanisms of action and possible applications. Ongoing exploration of both its benefits and risks is essential for developing safe and well-regulated uses.

THC has been studied for a variety of potential applications and is increasingly recognised in research for its possible therapeutic value. Its use has been examined across several areas of healthcare, with growing interest in its effects.

One of the most studied areas is the role of THC in pain management. Research has investigated its ability to influence pain perception in conditions such as multiple sclerosis, cancer and neuropathic pain through interactions with the body’s endocannabinoid system.

Studies have also highlighted THC’s antiemetic properties, noting its role in reducing nausea and vomiting associated with chemotherapy and certain treatments. In addition, it has been observed to stimulate appetite, which may be relevant for individuals experiencing appetite loss during medical care.

Despite its potential medical benefits, the legality of THC and medical marijuana varies across different countries and regions. Some countries have legalised the use of medical marijuana, allowing patients to access THC-based medicines with a prescription. However, it is important to note that the laws surrounding THC and medical marijuana can be complex and subject to change.

Recreational use of THC

THC is the compound responsible for the psychoactive effects of cannabis, making it widely associated with recreational use. When used, it interacts with cannabinoid receptors in the brain, leading to altered perceptions, shifts in mood and sensations of relaxation or euphoria.

Recreational use of cannabis has a long history, with evidence dating back to ancient civilisations. In China, an early medical text noted that cannabis in excess could produce visions, although references to its psychoactive use in ancient Chinese texts are scarce. In India, cannabis was widely used both as a medicine and as a recreational drug, and the Greek historian Herodotus described the Scythians being “delighted” by the smoke of burning hemp seeds.

Over time, recreational use has persisted in various forms, from smoking and vaporising to other regulated applications. In recent years, the availability of THC-containing products has expanded significantly, reflecting broader consumer interest in experiences linked to its psychoactive properties.

It is important to recognise, however, that recreational use carries potential risks. While many associate THC with relaxation and enjoyment, prolonged or excessive use may contribute to effects such as anxiety, paranoia or reduced cognitive performance. Responsible use and awareness of these risks remain essential.

Recreational cannabis use can offer relaxation and a sense of euphoria, often making it a popular choice in social or leisure settings. Still, it is important to approach use responsibly and remain mindful of the potential downsides.

Personally, I have never used THC or any other psychoactive drug for recreational use. Even if it were completely legal, I would be reluctant to use it for recreational purposes only, but we are all different and most of my colleagues in the cannabis industry do not share this opinion.

Exploring different strains and application methods

THC content can vary among different strains of cannabis, with some strains having higher levels of THC than others. This allows individuals to choose a strain that aligns with their desired recreational experience. There are also various application methods available, each offering a different way to experience the psychoactive effects of THC.

Common methods of applying THC in regulated contexts include smoking dried cannabis flowers, vaporising concentrates and using THC-infused formulations classified for specific use types. Each method has its own onset time and duration of effects, allowing users to adjust their experience based on personal preferences and desired outcomes.

Legal status of THC

The legal status of THC and cannabis has seen significant changes over time, with some countries decriminalising or legalising it for various uses.

In the United Kingdom, THC is classified as a controlled substance under the Misuse of Drugs Act 1971. This means that the production, possession and supply of THC are illegal, except in certain restricted circumstances.

However, there has been a growing recognition of the potential medicinal benefits of THC, leading to the development of medical marijuana programmes in some parts of the world.

In the UK, the law changed on 1 November 2018 to allow doctors on the specialist register to prescribe cannabis-based products for medicinal use. Licensed medicines available on NHS prescription include Epidyolex, a CBD medicine that does not contain THC, for certain rare forms of epilepsy, and nabiximols (Sativex), which contains THC and CBD, for muscle spasticity in multiple sclerosis.

On the other hand, recreational use of THC and cannabis remains illegal in the UK, with possession and supply offences carrying criminal penalties. Despite this, there have been ongoing debates about the potential decriminalisation or legalisation of recreational marijuana use, with some arguing that it could help reduce drug-related harms and generate tax revenue.

It is important to note that the legal status of THC varies from country to country, with some jurisdictions taking a more liberal approach towards its regulation. As attitudes and scientific understanding continue to evolve, it is likely that the legal landscape surrounding THC will continue to change.

When I wrote this article, this was the most recent information I could find on the legal status in the following countries. Some entries have since been updated with dated information on later changes, but cannabis laws change frequently, so the table may not reflect the current position in every country.

The legal status of THC is a complex issue, with different countries taking varying approaches to its regulation. Medical access has expanded in a number of countries, while recreational use of THC remains contentious. As scientific understanding of cannabis develops, regulators continue to weigh public health and safety against its potential medical applications.

THC side effects and addiction

While THC can provide benefits, it is important to be aware of potential side effects and the risk of addiction. THC, the main psychoactive component of cannabis, can cause short-term and long-term side effects. Common short-term side effects of THC use include impaired memory, altered perception of time, increased heart rate and dry mouth. These effects can vary depending on the individual and the amount of application, but they generally subside after the high wears off.

Long-term use of THC has been associated with a range of potential side effects. These include cognitive impairments, such as difficulties with attention, learning and memory. Chronic use of THC may also lead to respiratory issues, such as bronchitis, and an increased risk of mental health disorders, particularly in individuals predisposed to these conditions. Heavy and prolonged use of THC has also been linked to the development of cannabis use disorder, characterised by a loss of control over cannabis use and negative impacts on various areas of life.

It is crucial for individuals using THC to be mindful of their use habits and to monitor any potential side effects or signs of addiction. Seeking professional advice and support can be beneficial for those who want to better understand and manage the potential risks associated with THC use.

Table: common side effects of THC

The risk of developing an addiction to THC, like with other psychoactive substances, can vary from person to person. Most people who use cannabis do not develop cannabis use disorder, but the US Centers for Disease Control and Prevention estimates that approximately 3 in 10 people who use cannabis have it. The risk is higher in people who start using cannabis in youth or adolescence and in those who use it more frequently, and some may be more vulnerable due to genetic factors or underlying mental health conditions. THC addiction is generally characterised by a compulsive urge to use cannabis, difficulty controlling or reducing intake, and withdrawal symptoms when use is stopped. Approaching THC use responsibly and staying alert to signs of dependence is important.

As with any substance, it is essential to weigh both the potential risks and benefits of THC before use. Seeking guidance from healthcare professionals and keeping up to date with current research and regulations can help individuals make informed choices. Equally, compliance with the laws of one’s country or state is a necessary consideration.

THC is available in a wide variety of products, including dried flowers, oils, tinctures and edibles, each offering different methods of use. These formats allow individuals to tailor their experience according to preference and context.

Dried flowers: Often referred to as cannabis buds, dried flowers are the most traditional form of THC product. They are commonly smoked in joints or pipes, producing fast-acting effects. Potency and flavour can vary significantly across strains, providing a range of possible experiences.

Edibles: THC-infused foods such as gummies, chocolates and baked goods provide a discreet and convenient option. Because edibles are metabolised differently, their effects typically appear more slowly than with inhalation, and people may use more as a result, increasing the risk of negative effects. Starting with a low dose and allowing time for the effects to appear is generally advised.

Oils and tinctures: These concentrated products can be applied sublingually, under the tongue, or in some cases topically. How precisely the amount of THC can be measured depends on the product, and the onset of effects depends on the method of application.

Table: THC products and application methods

The effects of THC can vary depending on factors such as product type, dosage and individual tolerance. Legal status also differs worldwide: while some countries have legalised both medical and recreational cannabis, others maintain strict regulations. It is essential to be aware of local laws before purchasing or using THC products.

Beyond its regulated medical applications, research has examined how THC may influence areas such as pain management and appetite stimulation. Studies suggest that THC, as the main psychoactive compound in cannabis, interacts with the body’s endocannabinoid system, which plays a role in pain perception. By binding to cannabinoid receptors in the brain and spinal cord, it may alter pain signals and provide temporary relief.

Research has also explored THC’s role in appetite stimulation, particularly for individuals undergoing chemotherapy or experiencing appetite loss. Activation of cannabinoid receptors in the brain’s reward and appetite centres has been linked to increased hunger and greater enjoyment of food, which may support nutritional intake for those struggling with reduced appetite.

At the same time, THC’s psychoactive properties can produce side effects. These may include impaired coordination, changes in memory and cognitive function, increased heart rate, or temporary anxiety and paranoia. Whether used recreationally or in medical contexts, awareness of these effects and responsible use are essential. Consulting a healthcare professional is advisable to ensure safe and appropriate use.

THC research and future developments

Ongoing research into THC continues to expand scientific understanding of its potential applications and may contribute to future developments in medical use. Researchers are exploring a range of areas to better understand the role of this compound derived from the cannabis plant.

One key focus is THC’s influence on pain management. Studies have examined how it interacts with the body’s endocannabinoid system, which plays a role in regulating pain perception. This research has informed the development of THC-based medicines aimed at addressing conditions such as neuropathic pain and multiple sclerosis.

Another area of study looks at the potential anti-cancer properties of THC. Preclinical findings have suggested that it may affect tumour growth and trigger apoptosis, or programmed cell death, in certain cancer cell types. These results highlight the need for further investigation into THC’s possible role as an adjunct in cancer research.

Alongside these studies, scientists are also working to develop safer and more efficient delivery methods for THC. Research is exploring alternatives such as transdermal patches, inhalation devices and oral formulations, offering more personalised approaches to administration.

As research into THC continues to advance, it is crucial to consider the potential benefits and risks associated with its use. While medical marijuana and cannabis-based therapies hold promise for various conditions, further studies are needed to fully understand the long-term effects and potential interactions with other medications.

Overall, ongoing THC research shows potential for the future of medical cannabis and its applications. As scientists and medical professionals examine this field in greater detail, there is hope for new treatments, improved delivery methods and a better understanding of the therapeutic benefits that THC may provide.

Conclusion on the history of THC

The history of THC is a remarkable account of its discovery, development and role in both medical and recreational cannabis use in the UK and worldwide. THC, the primary psychoactive component of cannabis, has been part of human culture for thousands of years through the cannabis plant. Evidence of the plant dates back around 12,000 years in Central Asia, with cultivation and medicinal practices spreading through ancient China, Egypt and Greece.

In the 19th century, scholars and physicians introduced cannabis into Western medicine, sparking widespread interest in its potential. A major milestone came in 1964, when researchers in Israel identified the structure of THC, significantly advancing knowledge of cannabinoids and the endocannabinoid system. This discovery opened the door to deeper exploration of THC’s possible medical applications.

Today, cannabis is used in both medical and recreational contexts, though its legal status continues to evolve. Some countries have decriminalised or legalised cannabis for certain uses, while others maintain stricter controls. In the United Kingdom, medical cannabis is legal for specific conditions under prescription, while recreational use remains prohibited.

As scientific research continues, THC remains an important focus of study. Ongoing investigations aim to better understand its effects and refine its potential applications, shaping the future of cannabis in medicine and beyond.