Effects of THC on the Human Brain

The human brain is the most complex computer in the world. In one study trying to understand brain health and disease, scientists identified 3,313 different types of neurons in the brain, but there is much more to learn. Other studies have examined the effects of THC on the human brain. THC is the primary psychoactive chemical in marijuana (cannabis) plants.

One study of teen health in Australia and New Zealand dealt with the effects of THC on the human brain regarding depression and suicide. It showed that adolescents using cannabis were 2.5 times as likely to have depression and three times as likely to have suicidal ideas than those who did not use cannabis.

A study of adults who used cannabis daily showed there was five times the risk of psychosis compared to non-users. A Canadian study has shown that emergency department visits for cannabis syndrome increased by a factor of 13 between 2014 and 2021. Despite today’s concentrated cannabis products, science does not fully understand the effects of THC on the human brain, so users have become the test subjects.

Humans have long used breeding to increase desirable features in animals, such as dogs, and plants, such as corn. They have used the same methods on marijuana plants to increase the content of THC. The result is that today’s marijuana has a much more potent effect on the human brain. In 1995, the total THC by weight of marijuana was around 4%. Today it is 20% or more. Concentrated cannabis products can have THC content as high as 95%. Teen exposure to THC can lead to long-lasting problems with memory and learning. Use by teens is more likely to lead to addiction than adult use, and cannabis addiction is linked to schizophrenia.

Recreational drug use has a long history, but there is very little research available on the long-term effects of cannabis and the effects of THC on the human brain. The Christian concept of the human body as the dwelling place for God’s Spirit (1 Corinthians 3:16) advises against activities that harm our health. God speaks to us in verse 17, saying that if anyone defiles the temple of God (our body), there will be severe consequences. We are seeing that promise carried out in the adverse effects of cannabis use.

— John N. Clayton © 2024
References: “Transcriptomic diversity of cell types across the adult human brain” in the journal Science, and “The teen brain is especially susceptible to the harms of THC” in Science News magazine