Cannabis: What is THC and what are its side effects?

By Isabella TortaAugust 18, 2025

agrilab cannabis: cos'é il THC e gli effetti collaterali

In recent years, medical cannabis has been at the center of heated debate. THC, in particular, has been promoted as a natural solution for numerous ailments.

But is it really risk-free?

THC: what it is and what its therapeutic significance is

THC (tetrahydrocannabinol) is the primary psychoactive compound in cannabis. When we talk about THC, what is it ? We mean a substance capable of temporarily altering perception, mood, and consciousness.

Originally introduced by doctors into medical cannabis to relieve nausea and pain in terminal cancer patients, THC is now also used for chronic, non-terminal conditions. However, this expanded use is not always supported by solid evidence.

THC Effects of Cannabis: What the Studies Really Say

Despite marketing hype about its supposed benefits, scientific literature is cautious. According to a review published in the National Library of Medicine (PMC) , the benefits of THC are limited and the risks are underestimated.

Documented risks:

Dependence (9–20%, up to 50% in adolescents with daily use)
Cognitive deficits : impaired attention, memory, and learning
Increased risk of psychosis and schizophrenia
Cardiovascular events even in young and healthy subjects
Cannabinoid hyperemesis syndrome : cyclic vomiting and dehydration

As also confirmed by a meta-analysis on the effects of cannabis on the brain Lancet Psychiatry , the risk of psychosis is higher in regular users of high-potency THC.

THC meaning and clinical limitations

The clinical significance of THC lies in its ability to address some acute symptoms. However, in clinical practice, its use should be limited to:

chemotherapy-refractory nausea
appetite stimulation in HIV or advanced cancers
neuropathic pain in resistant cases

Outside of these contexts, the effects of THC-containing cannabis can be counterproductive, especially in frail patients.

CBD vs. THC: Clarifying the Difference is a Priority

The difference between CBD and THC is not only chemical, but above all functional.

CBD:

it is not psychoactive
it does not create dependence or tolerance
modulates inflammation without altering the mind

The benefits of CBD are documented for numerous conditions: epilepsy, inflammation, chronic pain, and anxiety. This is why, for long-term treatments, CBD for pain and CBD for inflammation are now considered a safer and more sustainable option.

Cannabis Effects and "Wellness" Misinformation

The rhetoric surrounding THC as a "natural and beneficial" substance is often the result of marketing campaigns. Only 22% of websites promoting medical cannabis mention the risks of THC .

Here's what you need to do:

Reviewing the clinical approach based on evidence
Providing accurate information on neurological, psychiatric and cardiac risks
Stress that THC is not without serious side effects
Avoid confusion between recreational THC and therapeutic CBD isolate

Conclusion

The narrative that presents THC as a "natural and safe" cure is scientifically flawed. Its risks are real and well-documented.

👉 Medical cannabis has value, but only if used with awareness, clearly distinguishing between the two main molecules: CBD vs THC .

✅ Promoting CBD isolate as a reliable therapeutic choice means protecting public health and rebuilding trust in the industry.

Find out how CBD Isolate can help with various conditions.

👉 Keep following us on the blog : in the next articles we will talk about all the pathologies that can be supported by CBD isolate.

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