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However, a new study suggests that teenagers who use marijuana regularly are at greater risk for long-term brain damage and declines in both IQ and cognitive functioning years later.
Later, the user may have feelings of paranoia and panic. The interaction of the THC with the brain is what causes these feelings. To understand how marijuana affects the brain, you need to know about the parts of the brain that are affected by THC.Here are the basics: 1  Neurons are the cells that process information in the brain. 2  Chemicals called neurotransmitters allow neurons to communicate with each other.ater, the user may have feelings of paranoia and panic. The interaction of the THC with the brain is what causes these feelings. To understand how marijuana affects the brain, you need to know about the parts of the brain that are affected by THC.