What Marijuana Does to Your Body and Brain

Marijuana's official designation as a Schedule 1 drug — something with "no accepted medical use" — means it is pretty tough to study.

Yet numerous anecdotal reports as well as some studies have linked marijuana with several purported health benefits, from pain relief to helping with certain forms of epilepsy.

Still, experts say more rigorous scientific analyses are needed. Use of marijuana, a psychoactive drug, can come with risks, especially in people who may be prone to addiction or mental illness. Take a look at how marijuana can affect your brain and body: 

Marijuana can make us feel good.

Marijuana can make us feel good. AP Photo/Brennan Linsley

One of weed's active ingredients, called tetrahydrocannabinol, or THC, interacts with our brain's reward system, the part that has been primed to respond to things that make us feel good, like eating and sex.

When overexcited by drugs, the reward system creates...

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