There's no dignity in smoking marijuana as your end draws near. Medically administered morphine will at least leave you compos mentis. Would you really want to make your last visit, to a dying relative, only to find them giggling and asking if you brought anything to eat?
Yes! Marijuana humor isn't necessarily insane.
But, I think this comment is off the mark. One can be so doped up on morphine that the patient is drifting in and out of consciousness. In that end extremity of pain, morphine is probably the only thing that will work. I think your problem here is with what is currently legal and what is not. I submit that is a problem that it should be in the public power to decide, and not writ in stone by the government.