"It's like we're meeting her for the first time." Lily's Story (Cannabis for Kids, Part 3)

Sarah and David Rowland's daughter Lily began having seizures when she was just six months old. Diagnosed with a severe case of epilepsy, she continued to have 200 to 300 seizures a day despite heavy medication. When the Ryans were told that the only other option was brain surgery, they began investigating alternative treatments in Colorado.

Click here to read more on what scientists are discovering about marijuana online in National Geographic magazine

Some parents are turning to cannabidiol (CBD) oil, a cannabis extract with little or none of the psychoactive compound THC, to treat their children who have cancer and epilepsy. The oil is currently legal in more than a dozen U.S. states, but the supply is limited. The science also lags the law—dosing standards haven't been set, and the effects of long-term use are unclear. Many doctors believe that more research is needed. In "Cannabis for Kids" a few parents share their experiences navigating the uncertainties of medical marijuana in America as they try to help their children.