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Marijuana is a naturally occuring herb. But like many others, it is considered as an illegal drug because of its potential for abuse and unavoidable negative effects on the body. In this article, we will look deeper into how this herb affcets our body.

For some, marijuana is, just like any other herbs, Nature’s gift to man. For others, marijuana is a toxic and addictive naturally occurring herb that should be avoided at all costs.

The debate over the health benefits of marijuana has been long standing, and up to today, opinions are still divided as to whether or not marijuana should be used routinely, just like any other herb. The point of this article is not to state whether or not or why or why not marijuana should or shouldn't be decriminalized. We are simply going to look at what marijuana is, chemically and medically speaking, and in that sense we will dissect its effects on human health, be it positive or negative.

What is Marijuana?

Also known as cannabis, marijuana is a psychoactive herb extracted from the plants Cannabis sativa, Cannabis indica, Cannabis ruderalis. It contains at least 483 compounds, out of which 83 are cannabinoids. Cannabinoids are chemical compounds which act on the cannabinoid receptors located in the human body (in the brain and in the immune system). The body itself releases a certain amount of cannabinoids, but those that are exogenous can be obtained from plants such as marijuana (phytocannabinoids).

How does Marijuana work?

The active component of marijuana is called Tetrahydrocannabinol (THC), and works similarly to our natural endogenous cannabinoids. 

To understand how marijuana works, it is crucial to gain a better understanding of our normal endocannabinoid system.

The Endogenous Endocannabinoid system

The body possesses a wider variety of cannabinoids receptors thoroughly distributed in the central and peripheral nervous systems. The two main categories of cannabinoid receptors are CB1 and CB2. They are found in higher quantities in areas involved in pleasure, memory, thought process, concentration, movement and balance, sensorium and perception, food intake, general metabolism and energy processing. These body organs include the hypothalamus, the nucleus accumbens, the vagus nerve, the brainstem (pons and medulla oblongata), the digestive system, the liver and the adipose tissue.

With that said, when someone smokes marijuana, the THC that it contains is transported through the blood and binds to the cannabinoid receptors. Given that THC is released in high contents, the cannabinoid receptors are over-stimulated, which creates the “marijuana high” that marijuana consumers usually experience. Marijuana effects are experience faster when smoked compared to when ingested, because inhalation allows a quicker and faster diffusion of THC in the blood stream, compared to digestion (that takes several hours to be completed and reduce the bioavailability of the drug)

Effects on Body Systems


It is commonly conceived that people who use marijuana experience short term memory defects. However, studies performed on mice treated with THC revealed impaired long-term memory, due to the suppression of the hippocampus (part of the brain responsible of consolidating long-term memories). However, a recent study demonstrated that treatment of rats with high dose of THC could stimulate the growth of hippocampal neurons. With that said, the effects of THC on memory truly depends on the dose, and possibly the type of neurons (whether excitatory or inhibitory) affected.


Endocannabinoids directly bind to CB1 receptors in hypothalamic nuclei to stimulate appetite. A study performed on mice revealed that mice whose CB1 receptor was knocked out were seen to be less hungry and considerably leaner compared to wild mice. Additionally, the endocannabinoid receptors affect taste perception by increasing the intensity of neuronal signaling in the taste cells. Lastly, by stimulating the receptors located in the nucleus accumbens, endocannabinoids triggers the reward and pleasure that we experience when eating food.

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