It has also been known, since (at least) 1974, that around 60 of the 420 or more "cannabinoids" that exist in THC, attained by smoking and/or orally ingesting marijuana, have proven on many occasions, both privately and through professional research, to have numerous different health benefits. Including reducing the size of cancer tumors and killing most forms of cancer cells, almost every time it's been tested.
I find it amusing they used 420 as the number of cannabinoids.
This article also mentions the Gerson Diet, which has been derided as hocus pocus (plus they advocate coffee enemas). I know a couple in California that swear by it, but they're both thin to the point of being unhealthy-looking. But hey, they don't have cancer!
There is a group of folks making hemp oil for cancer patients. Under the radar of the FDA.