States around the country — more than 23 in total — have legalized medical marijuana.

23 Fantastic health benefits of medical marijuana. Experts have been changing their minds too — recently, CNN’s chief medical correspondent Sanjay Gupta reversed his opinion on medical marijuana.

Many people agree with Gupta’s new stance, and believe that the drug should be legal for medical uses.  New laws will help researchers study the drug’s medicinal uses and better understand how it impacts the body.

There are at least two active chemicals in marijuana that researchers think have medicinal applications. Those are cannabidiol (CBD) — which seems to impact the brain without a high— and tetrahydrocannabinol (THC) — which has pain relieving (and other) properties.