offset the side effects of chemo, as things stand now, no doctor that recommend cannabis instead of kchemo, myself included. but there's a growing body of promising research. >> it it turns out it it fights the cancer itself. >> you're a doctor. you have talked to researchers. you're saying marijuana can kill cancer cells. >> i'm saying that and there are many other researchers saying that too. >> we have samples from our treated mice. >> like san francisco researchers, pierre and shawn mcalister who said they have seen firsthand what the cannabis compound can do. in their lab, they use cbd to kill mice and human cancer cells. we asked the american cancer society about all of this. in a statement to cnn, they said there's no available scientific evidence from controlled studies in humans that cannabis can cure or treat cancer. even landon's doctor prescribed his marijuana and is a firm believer in marijuana is caution about this. >> she decided to stop the chemo therapy from landon. as a doctor who has seen his progress, is that something you would be on board with that you would recommend