Recently legalized in Washington and Colorado, marijuana has medical and recreational uses but can also be damaging to our bodies and minds.
The high you get from marijuana comes from a chemical called Tetrahydrocannabinol, also known as THC, which is found in varying potency.
Most of THC's effects happen in the brain, where the chemical interacts with receptors on brain cells called cannibinoid receptors. Our bodies actually make chemicals very similar to THC, which are used in normal brain function and development. THC co-opts these natural pathways to produce most of its effects.
It blocks memory formation.
The active ingredient in marijuana acts in the part of the brain called the hippocampus to alter the way information is processed and how memories are formed. Animal studies have shown that this is particularly true while the brain is still developing— specifically why the legal smoking age is 21 in the states that have legalized it.
This blockage of memory formation can cause cognitive impairment in adulthood if use happens during adolescence, at least in rats. It can also quicken age-related brain cell loss, though marijuana has been shown to slow the progression of Alzheimer's disease.
It can mess up your reward system.
When the rewards system is overstimulated, for example, by the abuse of drugs like cocaine, it can go haywire and cause a dependence (or in extreme cases addiction) on whatever is providing the rewarding feeling. It can also diminish how rewarding normal things, like eating, feel.
This can cause apathy and dependence on the drug.
THC messes with your balance.
THC messes with brain areas called the cerebellum and basal ganglia, which regulate balance, posture, coordination, and reaction time. When these brain areas are disturbed, the user has a harder time walking and talking correctly, becoming quite clumsy. It also impacts their ability to drive.
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