How big of a doobie did it take before the US National Cancer Institute came up with that one. Sounds like a stoner statement to me. Maybe marijuana kills lung cancer that you get from smoking weed. Let's see, nope, that doesn't quite equate.
Try reading the link.

Its already proven that cannabis oil and other assorted marijuana related things help MANY diseases.
According to whom? You know as well as anyone, "studies" can and do say anything, it's just that most aren't reliable--only to "prove" someone's agenda. The weed clinics can't legally say weed cures or helps anything, and if you pay attention to their claims there's always a caveat included because legally they simply can't. Truth in advertising liability, you know.